All 20 episodes from the first four series of the BBC crime drama in which a murder squad investigate complex cases in London. One of the detectives, DI David Bradford (Hugo Speer), takes the investigations more seriously when his own wife suddenly disappears. Series 1 episodes are: The Politicians Son, Stag Night, Blood Lines, Sex Games and Connected. Series 2 episodes are: The Dark, The Ultimate Price, Family Affairs, Turf War and Capture. Series 3 episodes are: Grace, Cyber Bully, Blood, Control Freak and Crossing the Line. Series 4 episodes are: Wake-Up Call, Fallout, Old Wounds, Amnesia and Vendetta.
