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 and texting more than she should, 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.