Ali's drug addicted sister Gemma is found dead in her flat after a visit by Collersdale and Robert is not convinced when Ali claims to have lost contact with her a long time ago. Eventually Ali admits that Joe is Gemma's son, adopted by Ali and David because of his mother's addiction, whilst Collersdale, breaking into the Blackwells' house, gets closer to locating them. At the same time Reynolds, who killed his wife Susan, leading to Robert's resignation, plans an appeal - alleging that the police withheld information at his trial. Mark shows Robert a CCTV film of him kissing Susan but Robert claims that it was platonic. Robert now wonders how Reynolds knew where to shoot at him and Susan and suspects a police officer told him.
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