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Memory's Legion is the tenth book in The Expanse series, and serves as a collection of the various short stories and novellas penned by Ty Franck and Daniel Abraham across the series. The book was published on March 15, 2022.[1] The collection includes all of the previously-published Expanse short stories alongside a new and final short story, The Sins of Our Fathers, set after the events of Leviathan Falls.[2][3] The collection is the first time the novellas have been made available as one package, though the "The Last Flight of the Cassandra" story exclusive to The Expanse Roleplaying Game is not included.

Alongside the novellas, the collection also includes some authors' notes at the end of each story.



ML Polish cover

Polish cover

Hardcover edition[]

The book was first released as a hardcover by orbit on March 15, 2022.

Paperback edition[]

The book was released as a trade paperback on May 9, 2023.

Audiobook edition[]

The audiobook is narrated by Jefferson Mays, Daniel Abraham, and Ty Frank and is 16 hours and 22 minutes in length.

Other Languages[]

  • Polish: Legion Wspomnień (2022)
  • German: Das Protomolekül (2022)
  • Russian: Легион памяти (2022)
  • Czech: Zástup vzpomínek (2023)
  • French: La légion des souvenirs (2023)
  • Hungarian: Emlékek folyama (2024)


  • The alternate title Mnemosyne's Legion was considered by the authors but they found the name too obscure.[4] Mnemosyne is the Greek goddess of Memory or remembrance.[5]
  • The final novella, The Sins of Our Fathers was going to be also named Memory's Legion, but because the novella will also be available for purchase as a stand-alone novella, the publisher explained to the authors that selling the novella and the collection under the same name would lead to confusion.[3]


  1. Icon-hachette-22x22 Hachette Book Group - Memory's Legion by James S. A. Corey; NOTE: Appearance of Memory's Legion in the list is probably incorrect per Daniel Abraham on Reddit (other citation below).
  2. TOR•COM - James S.A. Corey Says the Final Expanse Novel Has Been Turned In by Andrew Liptak Tue May 18, 2021 11:51am
  3. 3.0 3.1 Icon-reddit-24x24 Daniel Abraham on Reddit Title of the last Expanse novella confirmed (but not really) October 5 2021
  4. Icon-youtube-22x22 Youtube - Alt Shift X interview
  5. Wikipedia Mnemosyne

See also[]

External links[]

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Publisher info