The Sunken Archive Books in Order
The Sunken Archive is an epistolary fantasy duology by Sylvie Cathrall, told through letters, footnotes, and marginalia, following the mysterious disappearance of a scholar in an underwater-adjacent archive world. The series began with "A Letter to the Luminous Deep" (2024) and concluded with "A Letter from the Lonesome Shore" (2025), both published by Orbit/Redhook (Hachette).
Publication order
In the order the books were originally released.
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Buy on Amazon2024 · Sylvie Cathrall
E. lives a solitary life in her underwater home until a strange creature outside her window prompts a correspondence with scholar Henerey Clel, which…
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A Letter from the Lonesome Shore
2025 · Sylvie Cathrall
A Letter from the Lonesome Shore is a 2025 book by Sylvie Cathrall. It is book 2 of the series The Sunken Archive.
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Frequently asked questions
What order should I read the The Sunken Archive books in?
Read them in publication order, starting with “A Letter to the Luminous Deep”. Start with “A Letter to the Luminous Deep.”
How many books are in the The Sunken Archive series?
We list 2 books by Sylvie Cathrall , published between 2024–2025.
Where can I buy the The Sunken Archive books?
Each title above links to Amazon. See our affiliate disclosure.
Reading order compiled from author/publisher guidance and verified bibliographic data. Spotted an error? We continuously correct the catalog.