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The cover of A Letter to the Luminous Deep by Sylvie Cathrall, featuring an underwater scene of kelp and sea creatures along with sunken books and writing utensils.

A charming fantasy set in an underwater world with magical academia and a heartwarming
pen pal romance, perfect for fans of A Marvellous Light and
Emily Wilde's Encylopaedia of Faeries.


cover design by Raxenne Maniquiz and Charlotte Stroomer

A beautiful discovery outside the window of her underwater home prompts the reclusive E. to begin a correspondence with renowned scholar Henerey Clel. The letters they share are filled with passion, at first for their mutual interests, and then, inevitably, for each other.

Together, they uncover a mystery from the unknown depths, destined to transform the underwater world they both equally fear and love. But by no mere coincidence, a seaquake destroys E.'s home, and she and Henerey vanish.

A year later, E.'s sister Sophy, and Henerey's brother Vyerin, are left to solve the mystery of their siblings' disappearances with the letters, sketches and field notes left behind. As they uncover the wondrous love their siblings shared, Sophy and Vyerin learn the key to their disappearance - and what it could mean for life as they know it.

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