Code of Conduct

S18, E83: The station is still in shock after Cass's murder. Simon Kitson is charged for the serial killing and forensics from his car make his future look grim. Simon commits suicide after pressure from Nick and a visit from his obsessive sister. Nick looks satisfied as the alarm from custody rings through the building. Luke tells Craig that Carl is HIV-positive and advises him to go for a test. Ruby and Gary embark on an undercover operation at a department store to try and prevent a predicted armed robbery. Gary is furious to be placed as an elf in Santa's grotto. Gina deals with a boy, Tommy, who has been accused of causing unnecessary injuries during a boxing match. Tommy turns out to be innocent and he asks Gina to find his real mum: he was adopted. His mother, Marilyn, turns out to be a cousin of one of Gina's old friends. Marilyn says she wants nothing to do with her son, within earshot of a devastated Tommy. Gina obviously has bad connections with Marilyn, but what has happened in the past?