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"Cleverly blending the real and imagined worlds until the reader can't differentiate the two, Knox has created a twisty, turny thriller that cuts through the heart of the modern true crime fascination, all while keeping us enraptured by it."—BuzzFeed
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"Pop your favorite Agatha Christie whodunnit into a blender with a scoop of Downton Abbey, a dash of Quantum Leap, and a liberal sprinkling of Groundhog Day and you'll get this unique murder mystery." —Harper's Bazaar
"Compulsively readable."—New York Times Book Review
From Stuart Turton, author of The 7 1/2 Deaths of Evelyn Hardcastle, comes an extraordinary new locked-room mystery.
A murder on the high seas. A remarkable detective duo. A demon who may or may not exist.