A Massachusetts teenager hid in the walls of his rejected date's home for six months, tormenting her family with mysterious knocking and messages—but the true horror emerged when he was released on bail and murdered a pregnant woman and her two children. Daniel LaPlante's 1987 crimes revealed how a juvenile justice system failure enabled an escalating predator to terrorize an entire town. Daniel LaPlante lived undetected inside the walls of the Bowen family's home for approximately six months, coordinating his disturbances to times when the father worked night shifts, turning a family's grief into a nightmare of terror and surveillance.