I tell myself that Max couldn’t kill anyone. He’s a family man now, different to who he was before. Even so, I should go to the police right away. But I can’t. Because if I do, I’m scared they’ll start to suspect me. How much do I really know about the girl in room 12? And if the truth comes out, how far will I go to protect my precious family?

I was just a little girl, fast asleep in my stroller, the day my mother was killed. I don’t remember anything about the sunny day that turned so dark. She’d be so happy for me now, 20 years later, with my dream job as a photographer, and I’m sure she’d love my new boyfriend, Gabriel. But all my happiness vanishes in a heartbeat when the man from our past walks toward me, his eyes on me for just a fraction too long.

With two young children, Mary hasn’t slept in what feels like years. For his part, Tim never feels safe enough to sleep. And so one hot, exhausting night, the two strangers meet while seeking solace in a nearby park. There, they witness something horrific: a violent attack in the window of a neighbouring house. Bonded by what they’ve seen, Tim and Mary are desperate to find answers. And when they see news reports of a missing woman who was last seen walking alone not far from them, the pair are convinced it’s her they saw being attacked—no matter what the police say.

For Helen and George, the remote fixer-upper in Cornwall was supposed to be a dream home, and a way to leave behind the problems they’re both running from. But something about the place feels wrong from day one. And why does Helen have a creeping feeling she’s seen this house before?

From the bestselling author of What You Did comes a stunning psychological thriller. One party. Thirteen people. By 3.02 p.m., one of them will be dead.