A Complete Guide to The 100, Light Years, The Ravens, Standalone Novels, Collaborations and Romanian Translations
Kass Morgan is an American author and editor best known for The 100, the young adult dystopian science fiction series that inspired the television adaptation of the same name.
Writing under the pen name Kass Morgan, she has created stories exploring survival, identity, friendship, loyalty, romance and the difficult choices people face in extraordinary circumstances.
Her work spans post-apocalyptic science fiction, space adventure, contemporary fantasy and romantic fiction.
Morgan also publishes under her real name, Mallory Kass. Her bibliography therefore includes books released under both names.
This complete Kass Morgan bibliography brings together her novels, series, short fiction, collaborative publications, companion works and verified Romanian translations.
The bibliography is organised by original publication date, with separate sections for series reading orders and Romanian editions.
📖 Kass Morgan: Complete Bibliography in Publication Order
The following chronology lists original works and separately identifies collaborative publications.
| Year | Title | Category / Series | Notes |
|---|---|---|---|
| 2010 | The Black Book of Buried Secrets | The 39 Clues | Companion publication; credited to Mallory Kass |
| 2013 | The 100 | The 100 #1 | Novel |
| 2014 | Day 21 | The 100 #2 | Novel |
| 2015 | Homecoming | The 100 #3 | Novel |
| 2016 | Rebellion | The 100 #4 | Novel |
| 2018 | 259 Million Miles | Meet Cute | Short story |
| 2018 | Light Years | Light Years #1 | Novel |
| 2019 | Supernova | Light Years #2 | Novel |
| 2020 | The Ravens | The Ravens #1 | With Danielle Paige |
| 2022 | The Monarchs | The Ravens #2 | With Danielle Paige |
| 2026 | Save the Date | Standalone | Adult novel published as Mallory Kass |
| 2026 | Royal Summer | Standalone | Young adult romance |
Bibliographical note: Meet Cute is a multi-author anthology, not a standalone Kass Morgan collection. Her individual contribution, 259 Million Miles, is listed in the chronology.
Likewise, The Black Book of Buried Secrets is a companion volume within the wider The 39 Clues publishing universe, rather than an instalment of a Kass Morgan original novel series.
🚀 The 100 Series — Complete Bibliography
Genre: Young Adult, Dystopian Science Fiction, Post-Apocalyptic Fiction
Original language: English
Number of novels: 4
Publication period: 2013–2016
The 100 is the series that established Kass Morgan’s reputation as a young adult science fiction author.
Following a catastrophic nuclear war, humanity survives in space, separated from the devastated surface of Earth.
When resources become increasingly limited, one hundred young offenders are sent to Earth to determine whether the planet can support human life again.
Their mission raises questions about survival, leadership, justice and the possibility of rebuilding civilisation.
📚 The 100 Reading Order
- The 100 (2013)
- Day 21 (2014)
- Homecoming (2015)
- Rebellion (2016)
The four novels form one continuous narrative and should be read in publication order.
1. The 100 (2013)
The first novel introduces the group of young people sent from their space colony to Earth.
For some, the mission represents an opportunity for freedom. For others, it may be a death sentence.
The survivors must confront their unfamiliar surroundings while navigating existing tensions and new alliances.
Romanian edition: Cei 100 — Nemira, 2015.
2. Day 21 (2014)
Twenty-one days after the landing, the young survivors face new dangers and unsettling discoveries.
Their assumptions about Earth begin to change, while relationships within the group become increasingly complicated.
Romanian edition: Ziua 21 — Nemira, 2016.
3. Homecoming (2015)
The third novel develops the conflict between humanity’s past and its uncertain future.
As more people become involved in events on Earth, the characters must reconsider questions of loyalty, authority and belonging.
Romanian edition: Întoarcerea acasă — Nemira, 2017.
4. Rebellion (2016)
The fourth and final novel brings the original series to its conclusion.
The survivors face another major threat that challenges their fragile attempts to build a new society.
Romanian edition: No verified Romanian translation identified.
📺 The 100 and Its Television Adaptation
The television adaptation of The 100 brought Morgan’s fictional premise to an international audience.
Although the series shares its basic concept and several characters with the novels, it developed a substantially different storyline.
Readers should therefore treat the books and television series as separate versions of the same initial premise.
The complete literary series consists of four novels, regardless of the television show’s episode or season count.
🌌 Light Years Duology — Complete Bibliography
Genre: Young Adult Science Fiction, Space Adventure
Number of novels: 2
Publication period: 2018–2019
With Light Years, Kass Morgan moved from post-apocalyptic Earth to a story involving interstellar conflict and military training.
The series follows cadets attending an elite space academy at a time when humanity faces a dangerous external threat.
Its protagonists come from different backgrounds and must overcome prejudice, rivalry and personal difficulties to work together.
📚 Light Years Reading Order
- Light Years (2018)
- Supernova (2019)
1. Light Years (2018)
The opening novel introduces a new generation of space cadets preparing for an uncertain future.
As they train for military service, tensions between different social groups threaten to undermine their cooperation.
The novel explores identity, friendship, ambition and the divisions within a technologically advanced society.
2. Supernova (2019)
The concluding novel continues the cadets’ story as the wider conflict intensifies.
The characters must confront the consequences of their decisions while questioning what they have been taught about their society and its enemies.
Romanian translations: No verified Romanian editions identified for either novel.
🔮 The Ravens Duology — Complete Bibliography
Genre: Young Adult Contemporary Fantasy, Paranormal Fiction
Co-author: Danielle Paige
Number of novels: 2
Publication period: 2020–2022
The Ravens is a collaborative fantasy series written by Kass Morgan and Danielle Paige.
Set within a university sorority, the story combines supernatural powers, secret traditions, friendship and dangerous rivalries.
Behind the apparently ordinary world of student organisations lies a hidden magical community.
📚 The Ravens Reading Order
- The Ravens (2020)
- The Monarchs (2022)
1. The Ravens (2020)
The first novel introduces a university sorority whose members possess magical abilities.
New friendships and hidden tensions become increasingly important as the characters discover the responsibilities and dangers associated with their powers.
2. The Monarchs (2022)
The concluding instalment explores the consequences of earlier events.
The characters face new threats while confronting questions about loyalty, personal ambition and the strength of their relationships.
Romanian translations: No verified Romanian editions identified.
Collaborative authorship: Both novels should be credited to Kass Morgan and Danielle Paige. Neither should be treated as a solo Kass Morgan publication.
💕 Standalone Novels
Kass Morgan has also published romantic fiction outside her principal science fiction and fantasy series.
Save the Date (2026)
Published as: Mallory Kass
Publisher: Atria Books
Original publication: 14 April 2026
Genre: Adult Contemporary Romance, Romantic Comedy
Save the Date is Mallory Kass’s adult fiction debut.
The novel takes place over a lavish wedding weekend during which secrets, unresolved feelings and unexpected complications threaten the celebrations.
Told through the experiences of three women, it explores friendship, family relationships, romantic expectations and the difference between appearances and reality.
Although published under the author’s real name, this novel belongs in the complete bibliography of Kass Morgan.
Royal Summer (2026)
Published as: Kass Morgan
Publisher: HarperCollins
Original publication: 12 May 2026
Genre: Young Adult Contemporary Romance
Royal Summer follows an American teenager whose plans for a summer in Scotland take an unexpected turn.
An encounter with a member of the British royal family leads to a romance complicated by personal expectations and the extraordinary circumstances surrounding the relationship.
The novel represents a move away from Morgan’s earlier science fiction and fantasy settings.
Romanian translations: No verified Romanian editions identified for either standalone novel.
📚 Short Stories, Anthologies and Companion Publications
The Black Book of Buried Secrets (2010)
Published as: Mallory Kass
Associated series: The 39 Clues
Publisher: Scholastic
Publication date: 26 October 2010
Category: Illustrated companion book
This publication explores background information, secrets and historical mysteries associated with the fictional Cahill family.
It is part of the larger The 39 Clues franchise.
Although associated with an established multi-author series, it is not one of the principal numbered adventure novels.
For bibliographical accuracy, it should be listed separately as a companion publication.
259 Million Miles (2018)
Author: Kass Morgan
Published in: Meet Cute
Publication date: 2 January 2018
Category: Young Adult Short Fiction
259 Million Miles is Kass Morgan’s contribution to Meet Cute, an anthology exploring the beginnings of romantic relationships.
The collection features original short stories by numerous young adult authors.
Morgan’s contribution incorporates speculative-fiction elements into the anthology’s broader romantic theme.
Meet Cute (2018) — Anthology
Publisher: Houghton Mifflin Harcourt
Category: Multi-author Young Adult Anthology
The anthology contains stories by several established authors, including Kass Morgan, Nina LaCour, Nicola Yoon, Katie Cotugno, Jennifer L. Armentrout and others.
Bibliographical distinction: Meet Cute and 259 Million Miles refer to the same contribution at different levels: the anthology and the individual story. They should not be counted as two separate Kass Morgan books.
📦 Collected Editions and Omnibus Publications
Collected editions are useful for readers who want to obtain several novels together, but they should not be mistaken for additional original works.
The 100 Complete Boxed Set
This edition collects all four novels:
- The 100
- Day 21
- Homecoming
- Rebellion
The boxed set is a collected edition, not a fifth instalment.
The 100: Books 1–3
Some collected editions contain only the original three novels.
These collections do not include Rebellion and should not be described as representing the complete four-book series.
The 100: Books 1–4
Digital omnibus editions collecting all four novels are also available.
For bibliographical purposes, these editions are recorded separately from the original publication chronology.
BookFairy catalogue rule: Reprints, format changes and collected editions do not create additional original works.
🇷🇴 Kass Morgan: Romanian Translations and Editions
The Romanian publishing history of Kass Morgan is primarily associated with Editura Nemira and the Cei 100 series.
Three Romanian volumes have been verified.
📖 Verified Romanian Editions
| English title | Romanian title | Publisher | Romanian publication | Translator | ISBN |
|---|---|---|---|---|---|
| The 100 | Cei 100 | Nemira | 2015 | Dorina Tătăran | 9786067581737 |
| Day 21 | Ziua 21 | Nemira | 2016 | Dorina Tătăran | 9786067586091 |
| Homecoming | Întoarcerea acasă | Nemira | 2017 | Dorina Tătăran | 9786064300614 |
Cei 100 (2015)
Original: The 100 (2013)
- Publisher: Nemira
- Collection: Young Adult
- Publication date: 28 April 2015
- Translator: Dorina Tătăran
- Format: Paperback
- ISBN: 9786067581737
Ziua 21 (2016)
Original: Day 21 (2014)
- Publisher: Nemira
- Collection: Young Adult
- Publication date: 1 April 2016
- Translator: Dorina Tătăran
- Format: Paperback
- ISBN: 9786067586091
Întoarcerea acasă (2017)
Original: Homecoming (2015)
- Publisher: Nemira
- Collection: Young Adult
- Publication date: 19 September 2017
- Translator: Dorina Tătăran
- Format: Paperback
- ISBN: 9786064300614
What About Rebellion?
Rebellion, the fourth novel in The 100, was published in English in 2016.
However, Nemira’s documented Romanian catalogue lists only the first three novels.
A Romanian edition of Rebellion has not been verified.
This means readers collecting the series in Romanian should not assume that the published Romanian set includes the complete original story.
Other Romanian Translations
As of October 2026, no Romanian editions have been verified for:
- Light Years
- Supernova
- The Ravens
- The Monarchs
- Royal Summer
- Save the Date
- The Black Book of Buried Secrets
The absence of a verified edition does not necessarily prove that no translation exists. These entries can be updated if additional publisher records become available.
📚 Recommended Kass Morgan Reading Order
Kass Morgan’s fictional series are independent of one another.
Readers do not need to complete The 100 before beginning Light Years or The Ravens.
For the clearest reading experience, each individual series should be read in publication order.
Option 1: Publication Order
Readers who want to follow the development of Morgan’s writing career can begin with The 100 and continue through her subsequent publications.
This approach highlights her movement between dystopian science fiction, space adventure, fantasy and romantic fiction.
Option 2: Reading by Genre
Dystopian Science Fiction
- The 100
- Day 21
- Homecoming
- Rebellion
Space Science Fiction
- Light Years
- Supernova
Contemporary Fantasy
- The Ravens
- The Monarchs
Standalone Romance
- Royal Summer
- Save the Date — published as Mallory Kass
There is no required order between the standalone novels.
🦋 Kass Morgan on BookFairy
Kass Morgan’s work offers several entry points for readers interested in science fiction, fantasy and young adult literature.
Her books combine imaginative premises with personal conflicts involving loyalty, identity, friendship, romance and the responsibilities of leadership.
BookFairy brings together author guides, complete bibliographies, publication chronologies, Romanian translations and personal reading experiences.
📖 BookFairy Reviews
The 100 / Cei 100
Add the existing BookFairy review link and linked cover image here.
Additional reviews will be linked as they become available.
👤 Kass Morgan Author Guide
For more about the author, her writing, major themes and recommendations for new readers, visit:
Kass Morgan — Author Guide | BookFairy
📖 Further Reading & Bibliographical Sources
The publication information in this bibliography has been checked against publisher catalogues, library records and bibliographical resources.
- Hachette Book Group — Kass Morgan
- Hachette UK — Kass Morgan
- Simon & Schuster — Mallory Kass
- Simon & Schuster — Save the Date
- HarperCollins — Royal Summer
- Scholastic — The 39 Clues
- Nemira — Kass Morgan
- Nemira — Cei 100
- Nemira — Ziua 21
- Nemira — Întoarcerea acasă
Bibliographical scope: original works published through October 2026. Reprints and collected editions are identified separately to avoid duplicate entries.
