Bryden and Sam have it all: thriving careers, a smart apartment in a luxury condominium, supportive friends and a cherished daughter. The perfect life for the perfect couple. Then Sam receives a call at his office. Bryden–working from home that day–has failed to collect their daughter from daycare. Arriving home with their little girl, he finds his wife’s car in the underground garage. Upstairs in their apartment her laptop is open on the table, her cell phone nearby, her keys in their usual place in the hall.

Author Grady Green is having the worst best day of his life. Grady calls his wife to share some exciting news as she is driving home. He hears Abby slam on the brakes, get out of the car, then nothing. When he eventually finds her car by the cliff edge the headlights are on, the driver door is open, her phone is still there. . . but his wife has disappeared. A year later, Grady is still overcome with grief and desperate to know what happened to Abby. He can’t sleep, and he can’t write, so he travels to a tiny Scottish island to try to get his life back on track. Then he sees the impossible.

Mackenzie Casper is a brilliant student. But she is best known for her mother, a best-selling author whose dark, twisted thrillers have a dedicated worldwide fanbase. When her mother dies in an accident, fans across the world are left grieving, and the investigators are asking: Was that really an accident?

Sydney Shaw, like every single woman in New York, has terrible luck with dating. She's seen it all: men who lie in their dating profile, men who stick her with the dinner bill, and worst of all, men who can't shut up about their mothers. But finally, she hits the jackpot. Her new boyfriend is utterly perfect. He's charming, handsome, and works as a doctor at a local hospital. Sydney is swept off her feet.

Nic wants nothing more than to move on from her sister’s disappearance and the state it’s left her in. But then one day, Jules’s sister, Jenna Connor, walks into Nic’s life and offers her something she hasn’t felt in a long time: hope. What follows is a gripping tale of two sisters who will do anything to find their missing halves, even if it means destroying everything they’ve ever known.