'Tess Stimson is the master of the didn't-see-that-coming twist' LISA JEWELL

The brand new suspense thriller from the Sunday Times and USA Today bestseller.

YOU CAN'T SAVE THEM ALL. WHO DO YOU CHOOSE? . . .

This year, for the first time, the high school prom will be held on a luxurious cruiser on the lake. Sisters Amy and Iris are thrilled to chaperone, watching their sons step into adulthood in pressed suits and shiny shoes. It's a night of pride, celebration - and promise.

Until the boat sinks.

As darkness falls and the air begins to run out, buried secrets surface. Trapped beneath the lake, one of the sisters is forced to make an unthinkable choice: sacrifice her own son - or let her nephew and twenty-one other teenagers drown.

One year later, a girl will wake up from her coma, ready to tell everyone what really happened at the bottom of the lake.

And someone needs to keep her quiet - this time, for good . . .

A pulse-pounding novel of small-town secrets, lies and betrayal - with a twist you won't see coming.