Masters is assigned as contact officer for a notorious child killer, Lesley Palmer, who has been released after spending twenty years in prison. However, her situation is immediately compromised after she allows a former cell mate to stay at her safe house, and is then arrested after shoplifting from a local newsagents. Meanwhile, Perkins and De Costa deal with a Polish national who has been assaulted outside a clip joint. The only witness to the incident refuses to talk, until Valentine recognises her and persuades her to make a statement. Murphy's suspicions about Kent begin to grow when she and Bryant deal with an assault victim, only to discover that she is one of Kent's old flames.