Part 1 of 2. The investigation of a multi-vehicle road accident unravels the shocking secrets of the complete strangers involved, revealing smuggling, murder, international intrigue, and betrayal. A remarkable cast led by Douglas Henshall (Primeval) and Kate Ashfield (Shaun of the Dead) portray the stories of the victims, survivors, and rescuers, who all share a single defining moment. (The original UK version)

DI Tolin becomes suspicious when one of the survivors commits suicide a tad conveniently. And the reason for Danny's flight is revealed.

Confessions abound as Tolin confronts the man who destroyed his life. And Christine learns why her mother was on that road.

DI Tolin closes the case, and several other mysteries are resolved as an amateur video emerges that may explain everything.