In 2007, Cora, Faye, Anna and Julia returned home from a week together in Ibiza with secrets to keep. When they agreed never to contact each other again, all traces of their holiday were erased. Or so they thought. Now, almost seventeen years have passed since that trip and Anna's sister Kim is still picking up the pieces after Anna abruptly abandoned her life to start over in London, the occasional Christmas card her only contact ever since.

My baby is missing. Everyone thinks it’s my fault. I’m so scared carrying my delicate newborn, Lola, home from the hospital. It wasn’t an easy birth and she is so small. Seeing her gorgeous little face look up at me I swear I’ll never let anyone hurt her. But maybe I should have been protecting her from myself…

It’s been ten years since Alison’s perfect world fell apart. Ten years since her son Sam disappeared while on a family holiday. Lost at sea, they said, his body never found. And even though her brother and sister were supposedly looking after the kids, Alison will always blame herself. Caught in a spiralling web of all-consuming grief where the lines between reality and fantasy blur, Alison refuses to let go. So when her ex-husband seeks to have Sam officially pronounced dead, Alison embarks upon a desperate and harrowing quest to discover what really happened that day on the beach.

Together, Edward and Isabel move to London. They are young and in love, occupied by friends, work and fun. But late on a spring evening when they are thirty years old, their home is invaded by a serial killer. In the wake of this violation, each tries to come to terms with a night that changed everything—and their marriage begins to crumble. Twenty-five years later, their tormentor is caught, and Edward and Isabel reunite for his sentencing. Isabel has waited years for the man who nearly ended her life to be brought to justice. Edward has tried to think about anything else.

When former Detective Inspector Jessica Hirsch boards the London Underground, it should be just a few short stops home at the end of another long day. But as the tube barrels from Baker Street, it’s brought to an abrupt stop – there is an electrical fault, leaving the train stranded. As the lights go out, Jessica pushes through into the driver’s cabin. There, she finds his lifeless body, a knife embedded deep in his back. But if nobody could get into the cabin from the outside, and nobody could get into the front carriage, the realization strikes hard—there's a murderer among them