The Sunken Archive books in order

Q: "How many books are in the The Sunken Archive series?"

"There are two books in the The Sunken Archive series, published between 2024 and 2025."

Q: "What is the first book in the The Sunken Archive series?"

"The first book in the The Sunken Archive series is A Letter to the Luminous Deep, published in 2024."

Q: "Do The Sunken Archive books need to be read in order?"

"Yes, A Letter to the Luminous Deep should be read first, as A Letter to the Lonesome Shore continues the story and relationship established in the first book."

Reading order

#	Title	Published	Author	Buy on Amazon
1	A Letter to the Luminous Deep	2024	Sylvie Cathrall	Buy
2	A Letter to the Lonesome Shore	2025	Sylvie Cathrall	Buy

The Sunken Archive is a two-book fantasy series by Sylvie Cathrall, told through letters, notes, and documents exchanged between characters. A Letter to the Luminous Deep (2024) introduces two scholars who begin corresponding about mysterious underwater phenomena, and their professional exchange gradually develops into something more personal.

A Letter to the Lonesome Shore (2025) continues the story. The epistolary format gives the series a distinctive feel among fantasy novels, and the combination of mystery, romance, and world-building has earned a strong readership.

Frequently Asked Questions

How many books are in the The Sunken Archive series?

There are two books in the The Sunken Archive series, published between 2024 and 2025.

What is the first book in the The Sunken Archive series?

The first book in the The Sunken Archive series is A Letter to the Luminous Deep, published in 2024.

Do The Sunken Archive books need to be read in order?

Yes, A Letter to the Luminous Deep should be read first, as A Letter to the Lonesome Shore continues the story and relationship established in the first book.

Reading order#

Frequently Asked Questions

Reading order