An underwater treasure-chest to be slowly unpacked full of things I adore: nosy and loving
families epistolary romance gorgeous worldbuilding and anxious scholars doing their best to
meet the world with kindness and curiosity' Freya Marske author of A Marvellous Light A
charming fantasy set in an underwater world with magical academia and a heartwarming penpal
romance perfect for fans of A Marvellous Light and Emily Wilde's Encylopaedia of Faeries. 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. Praise for
Sylvie Cathrall: 'Cathrall's debut caught me up on a wave of whimsy and swept me away with its
charm. A story to be cherished' Lyra Selene author of A Feather So Black 'A Letter to the
Luminous Deep is a fascinating and charming story told in a uniquely elegant voice. A watery
wonder of a novel! I loved it.' Louisa Morgan author of A Secret History of Witches 'A Letter
to the Luminous Deep is like nothing I've read before. The heartfelt intimacy of the epistolary
narrative juxtaposed with the magnificent oceanic world-building results in a novel that is
at once deeply human and mind-bogglingly imaginative. Both the setting and the story are
exquisite but it was the lovingly crafted voices of the characters that kept me hooked from
beginning to end' Megan Bannen author of The Undertaking of Hart and Mercy
