A group of strangers arrive on a beautiful but remote island, ready for the challenge of a lifetime: to live there for one year, without contact with the outside world. But 12 months later, on the day when the boat is due to return for them, no one arrives. Eight people stepped foot on the island. How many will make it off alive?

Two days ago, the Wilson family checked into the imposing, glass-fronted Lodge, surrounded by snow and perched perilously on the edge of a cliff looking out to a gray sea. Not everyone was looking forward to the family get-together. But mother-in-law Angela insisted the winter trip would help heal their rifts....

When Amelia is invited to an all-expenses-paid retreat on a private island, the mysterious offer is too good to refuse. Along with six other strangers, she’s told they’re here to test a brand-new product for Timeo Technologies. But the guests’ excitement soon turns to terror when the real reason for their summons becomes clear. Each guest has a guilty secret. And when they’re all forced to wear a memory-tracking device that reveals their dark and shameful deeds to their fellow guests, there’s no hiding from the past. This is no luxury retreat - it’s a trap.

When I first walked into Jake and Megan’s immaculate home, I felt totally at ease. Sitting in the crisp white living room, they held hands and talked lovingly about their baby girl, Fern. As the weeks passed, I began to think I’d made a mistake in taking the job. Jake was overly friendly from the start, watching my every move and always offering to drop me home, even though it was out of his way. And Megan seemed to take pleasure in telling me off in front of her husband, blaming me for things I hadn’t done.

This holiday is the first time my husband Jeff and I have been on our own in years, and I want it to be a fresh start. We can walk along the beach, eat ice cream in the bright Spanish sun, and fall in love again.