When Hannah packs up her past and moves to the cottage next door to her sister, she hopes the luxe neighborhood and close family ties will be the perfect escape for her son and the shadows that trail them. But when a young girl goes missing days after they unload their final boxes and her son is quickly thrown under suspicion, Hannah must do whatever it takes to protect her child. Even if that means pointing the blame her sister's way instead. With investigators swarming and neighborhood scrutiny closing in, the divide between two sisters grows. As one fiercely defends her husband, the other shields her boy from the crime, keeping quiet the secrets that might unravel it all. And all the while, one young girl has vanished, and someone is to blame.

Her only daughter has just gone away to college, and Maggie O'Farrell knows she's turning into one of those helicopter parents she used to mock. Worrying constantly, texting more than she should, even occasionally dropping by the campus "just to say hi." But Maggie can't shake the feeling that something terrible is about to happen to Emma. And then, just as Maggie starts to relax, her daughter disappears. The clues are disturbing. An empty dorm room where Emma was supposedly living. A mysterious boy described as Future Husband in her phone. Dormmates who seem more sinister than friendly. As Maggie combs over the campus looking for signs of her daughter, she learns more about Emma's life than she ever thought possible.

Any of the Warners could have been behind a tragic Fourth of July weekend accident. Having spent the past three decades' worth of summers on Nantucket, the Warners are as much a part of the island as the crust of salt on the ferry. But this year is different: Tripp is no longer the father he was, and it becomes clear that nothing can survive the ravages of time. When tradition turns to tragedy, the creaky old house swirls with suspicion. There are just so many reasons to want someone gone. With no easy answers as to how, why or who, the Warners must face another frightening question: Do they really want to know the truth?