From the global multi-million-copy bestselling author of The Girl on the Train and A Slow Fire Burning comes her most suspenseful and powerful thriller yet.

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 isolation.

But when a shocking discovery is made in an art gallery far away in London, a visitor comes calling.

And the secrets of Eris threaten to emerge . . .

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She no longer sleeps when the tide is out, she only rests when the sea separates her from the land. When she knows no one can sneak up on her.

‘The Blue Hour swept me along on a tide as unforgiving and irresistible as the one around the island of Eris.’ VAL MCDERMID, Sunday Times bestselling author of the Karen Pirie series

'A masterpiece! Gorgeous and chilling, and I couldn’t put it down.' SHARI LAPENA, Sunday Times bestselling author of Everyone Here is Lying

'The best Paula Hawkins yet, by a tense and haunting mile.' LEE CHILD

'Extremely hard to put down.' MICK HERRON

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