An internet killer is targeting people who believe they wish to die and Mooney thinks he knows how to trap him. Renko and Hicks change tactic and bring the fight to Grace's door.

Cast: Jim Sturgess, Agyness Deyn, Nikki Amuka-Bird, Derek Riddell, Jojo Macari, Lorraine Burroughs, Aisling Bea, Varada Sethu, Owain Arthur, Joplin Sibtain, Adrian Rawlins, Kae Alexander, David J Biscoe, Anthony Carrigan, Daniel Coonan