When nine-year-old best friends Charlie and Amy disappear, two families are plunged into a living nightmare. A text message confirms the unthinkable; that the girls are the victims of a terrifying kidnapping. And when a second text message pits the two families against each other for the life of their children, the clock starts ticking for D.I. Kim Stone and the squad. Seemingly outwitted at every turn, as they uncover a trail of bodies, Stone realizes that these ruthless killers might be the most deadly she has ever faced. And that their chances of bringing the girls home alive are getting smaller by the hour. Untangling a dark web of secrets from the families' past might hold the key to solving this case. But can Kim stay alive long enough to do so? Or will someone's child pay the ultimate price?