The Dead Land

S6 E4: Someone is killing homeless men. Someone is feeding them, bathing them, wrapping them in paper and- bizarrely- salt, stabbing them through the heart, and then dumping their bodies around the financial district of Bradfield.Tony and Alex pursue the available clues until a family bereavement pulls Alex away from the case. Suddenly Tony finds himself working with a new detective: ambitious young Oxbridge graduate Hall – against whom Tony is initially prejudiced until he discovers that he’s dealing with a trained psychologist who’s a big fan of Tony’s own work.