Sean surprises Rachel when he tells her that he has been in contact with her estranged mother, who would love to see her. Unable to accept that Janet has ended their affair, Andy punishes her by keeping her out of the heart of the investigation - which leads to a painful row. Meanwhile, the team look into the murder of Leon Foster. At first, Leon's death looks like a typical gang killing, but the discovery that he was sexually mutilated raises suspicions that this could be a domestic murder.