One late spring evening in 2010, Shannan Gilbert ran through the oceanfront community of Oak Beach screaming for her life and was never seen again. No one thought much about what had happened to the twenty-four-year-old Craigslist escort. The Suffolk County police, too, seemed to have paid little attention—until seven months later, when an unexpected discovery in a bramble alongside a nearby highway turned up four bodies, all evenly spaced, all wrapped in burlap. But none of them Shannan’s. Like Shannan, all four women were petite, in their twenties, and had come from out of town to work as escorts, and they all had advertised on Craigslist and its competitor, Backpage. This book is a portrait of the victims of the Long Island Serial Killer, of the underside of the Internet, and of the secrets we keep without admitting to ourselves that we keep them.