In 1993, Robert convinces his college friends he's an MI5 agent. Decades later, a man named David exerts an extreme level of control over a family.

The father of an early victim raises the alarm with authorities about his daughter's safety. Decades later, the police chase down a bizarre lead.

As Robert continues to exploit and ruin lives, the authorities set a trap in London. Meanwhile, in the present, Sandra's children hold out hope.