'Non-stop twist after twist . . . I started reading and did not come up for air until I was done. It's that good.' New York Times bestselling author Melissa Storm.

She's meant to care for my family. But actually she wants to harm us all.

How does an 81-year-old woman, who hasn't left her bedroom - let alone the house - without assistance in months, simply vanish into thin air? I'm trying not to freak out at the thought of my mother wandering the neighborhood, lost in a maze of confusion.

We found her - but that was the moment I knew I needed help. I'm at breaking point. I'm a stay-at-home mom. I love my four-year-old twins deeply - but they're a handful. My husband's always away on business. My mother's in the early stages of dementia. It's a lot.

So I let Dana into my home.

She's the answer to my prayers. She'll be my mother's live-in caregiver.

Soon there are red flags.

I catch Dana gazing at my husband when she thinks I'm not looking. She tells my daughter she's 'part of the family now'. My son Sam is becoming silent and withdrawn.

And then, a few weeks after Dana's arrival, I enter my mother's bedroom - and get the shock of my life.

I ask Dana to leave. But she won't.

AN EXHILARATING BLEND OF BREATHTAKING SUSPENSE AND NAIL-BITING TENSION WITH A SHOCKING FINAL TWIST.

Perfect for fans of Freida McFadden, Daniel Hurst, Valerie Keogh, Lucy Foley, Shari Lapena, T.M. Logan and Clare Mackintosh.