Anna Maybourne dropped out of university to move to the farming town of Harper's Creek with her mother, sister and grandmother. They don't talk about why.
They hoped being back home might help Grandma's dementia - but it only descends deeper - while Anna becomes obsessed with the murder of two local girls, exactly three years apart.
The case was closed, but as the next three-year anniversary looms - and the town suffers a drought - people pray, people worry, and people wait.
But Anna believes that the killer is watching and that Grandma somehow knows more than she should. They say both are, in their own ways, mad.
Because when Grandma speaks, only Anna understands that instead of being over, the mystery seems like it's starting again...
A murder mystery unlike any other: full of secrets, suspense, and a shocking twist that could only come from the mind of Sarah Pinborough...
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PRAISE FOR SARAH PINBOROUGH
'Pinborough writes like an absolute dream' RICHARD OSMAN
'Sarah Pinborough is a twisted genius' LISA JEWELL
'A cracking good story ... You'll never guess the ending' STEPHEN KING
'Full of (the) clever twists... I'm a big fan' HARLAN COBEN
'No one tells stories like Sarah Pinborough' CHRIS WHITAKER