When a vulnerable woman goes missing in the Dublin Mountains police assume she has committed suicide. But a chance discovery by a group of fishermen, kick starts an incredible murder investigation that leads to the door of a very surprising suspect. 

Graham Dwyer is a successful architect and a happily married father of two. But he is leading a double life of twisted kinks and violent fetishes and now the police suspect, even murder. Dwyer has covered his tracks well and thinks he's got away with his crime but painstaking detective work finally unmasks the killer and puts him
behind bars.

With testimony from eye witnesses and exclusive access to the Irish police force (The Garda) we hear first hand from the detectives about the incredible investigation and how they out smarted Dwyer and brought him to justice.