Sylvie Cathrall books

Sylvie Cathrall is a fantasy author known for The Sunken Archive series, an epistolary fantasy duology that begins with A Letter to the Luminous Deep (2024).
Author · Fantasy · Epistolary Fiction · Romance

The Sunken Archive Reading Order

Title Published Buy on Amazon
A Letter to the Luminous Deep 2024 Buy
A Letter to the Lonesome Shore 2025 Buy

Sylvie Cathrall is a fantasy author whose debut series, The Sunken Archive, began with A Letter to the Luminous Deep in 2024. The book is told entirely through letters and documents exchanged between characters, giving it an epistolary format that has drawn comparisons to classic letter-novels.

The second book, A Letter to the Lonesome Shore, followed in 2025. Cathrall’s writing combines fantasy world-building with a romance arc, and the letter-based format has been particularly popular with readers who enjoy unusual narrative structures.

Frequently Asked Questions

How many books has Sylvie Cathrall written?

Sylvie Cathrall has written two books in one series.

What was Sylvie Cathrall's first book?

Sylvie Cathrall’s first book is A Letter to the Luminous Deep, published in 2024.

What is The Sunken Archive series about?

The Sunken Archive is a fantasy duology told through letters exchanged between two scholars studying mysterious underwater ruins. The series blends romance, mystery, and fantasy world-building in an epistolary format.

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