A teenage girl, brutalized and discarded. A rural sheriff, gunned down and left to die. A beloved landmark, destroyed in an instant. A tidal wave of violence is rushing full-speed toward the quiet Chicago suburb of Naperville, Illinois. Detective Emily Thompson is locked and loaded—ready to stop the bloody crime spree in its tracks. But she’s up against a deadly countdown that threatens everyone she knows and loves. . . . Her partner. Her best friend. Her whole world. In these final desperate hours, Emily will bring down the most diabolical killer she has ever faced—or die trying . . .