Kate and Gerry McCann were at a beautiful holiday resort when the unthinkable occurred. As the British doctors dined across the swimming pool from their vacation apartment, their three-year-old daughter, Madeleine, vanished from her bed in the Portuguese beach town of Praia de Luz. Once the McCanns realized their daughter was abducted, they courted the media and enlisted celebrities to publicize the case. One investigator put forward a theory that the McCanns were somehow involved in their daughter's disappearance, and they were even named suspects at one point, but were eventually cleared. Fifteen years later, after unpeeling one dark layer after another, investigators have a new suspect in the unsolved case.