A Letter to the Luminous Deep

"This book is not shaped like a book, and I mean that as a compliment. It is instead 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. Take a deep breath and dive in."—Freya Marske, author of A Marvellous Light

"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 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

“A shimmering, delicately crafted delight of a book, steeped in love for the wonder of nature and the vagaries of archival research. Readers looking for heartwarming romance and scholarly mystery against the backdrop of a wildly imaginative world will be charmed.”—H.G. Parry, author of The Magician’s Daughter

"With its gorgeous underwater setting and whimsical academic sensibility, A Letter to the Luminous Deep is a strange, epistolary wonder." —Mary McMyne, author of The Book of Gothel

"Cathrall spins a captivating tale of mystery and romance set in an enchanting underwater society in her wondrous debut...This poetic and emotional tale announces the arrival of a skilled storyteller."—Publishers Weekly

“A poignant epistolary adventure set in an underwater landscape filled with academics, explorers, and artists.”—BookPage

"Cathrall debuts with a wonderfully charming epistolary novel...Readers will want to savor the delightful letters that make up this cozy fantasy set in academia and an underwater world."—Library Journal

"Through these letters, a tale of love, friendship, and secrets unfolds, captivating readers with its whimsical charm and intriguing plot twists. In her debut, Cathrall skillfully addresses themes of mental health and anxiety, adding depth and authenticity to the characters' experiences. With its cozy-fantasy atmosphere and rich character development, A Letter to The Luminous Deep will appeal to fans of epistolary novels and readers who enjoy stories with elements of romance, mystery, and fantasy."—Booklist

"Whimsical and heartfelt, with a radar trained on delight."—Kirkus

"A heartwarming, beautifully written debut." —Observer