A Letter to the Luminous Deep

 A Letter to the Luminous Deep by Sylvie Cathrall, 432 pages

A year ago E. Cidnosin and scholar Henerey Clel disappeared when E's marvelous home beneath the sea was destroyed. The two had begun a correspondence first to discuss natural history, but soon because they are two lonely individuals who come to care about each other very deeply. As E's sister and Henerey's brother begin to reconstruct their siblings' last days (and build their own friendship), they too are quickly pulled into the same mysteries that drew in E and Henerey.

This book is set in such a fascinating world. The planet is almost entirely covered in water, and society has a distinctly Victorian feel and is mostly organized around three colleges, while we get only hints of the apocalyptic event that started this society. This novel is epistolary, told entirely in letters and the odd journal entry. This book reminded me a lot of Victorian Science Fiction, which definitely won't be for everyone, but I personally loved it. I loved all of the characters, and was completely invested in their relationships of every description. I would definitely recommend this to fans of Emily Wilde's Encyclopedia of Fairies and also anyone who likes unusual worldbuilding.