The powerful new thriller from the No.1 bestselling author, Paula Hawkins

'What an addictive, exhilarating book, so beautifully composed and brilliantly conceived.' DONAL RYAN

'A tensely atmospheric and layered exploration of artistic drive and devotion' CHARLOTTE WOOD

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The masterful new thriller from the global No.1 bestseller and one of our most powerful psychological storytellers.

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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'The Blue Hour swept me along on a tide as unforgiving and irresistible as the one around the island of Eris' VAL MCDERMID

'The best Paula Hawkins yet.' LEE CHILD