Faye is 39 and single. She's terrified she may never have the one thing she always wanted: a child of her own.

Then she discovers a co-parenting app: Acorns. For men and women who want to have a baby, but don't want to do it alone. When she meets Louis through it, it feels as though the fates have aligned.

But just one year later, Faye is on the run from Louis, with baby Jake in tow. In desperate need of a new place to live, she contacts Rachel, who's renting out a room in her remote Norfolk cottage. It's all Faye can afford - and surely she'll be safe from Louis there?

But is Rachel the benevolent landlady she pretends to be? Or does she have a secret of her own?

'Pulse-pounding' LOUISE MUMFORD

'The perfect thriller' EMILY FREUD

'Surprising and original' Lesley Kara

'I love Charlotte's dark, messy takes on modern relationships' Claire McGowan

'Tense, twisty and deeply unsettling' BP Walter

'Unpredictable, tense and engrossing' Rebecca Fleet

'A writer at the top of her thriller game' Louise Mumford