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"The best Paula Hawkins yet – by a tense and haunting mile." – Lee Child

"An atmospheric, stylish puzzle box of a thriller... truly exceptional." – Liz Moore, New York Times bestselling author of The God of the Woods

"A masterful exploration of the nature of obsession...I loved it." – Angie Kim, New York Times bestselling author of Happiness Falls and Miracle Creek

The propulsive and powerful new novel from the #1 New York Times bestselling author of The Girl on the Train

Welcome to Eris: an island with only one house, one inhabitant, one way out. Unreachable from the Scottish mainland for twelve hours each day.

Once home to Vanessa: A famous artist whose notoriously unfaithful husband disappeared twenty years ago.

Now home to Grace: A solitary creature of the tides, content in her own...