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All the episodes from the British television crime drama in which accomplished investigator DI Cadi John (Sian Reese-Williams) sets about solving a case involving the disappearance of a girl five years prior. When the girl's body is found in a lake, Cadi and her partner DS Owen Vaughan (Sion Alun Davies)'s investigation entangles them in a web of cold murder and a possible wrongful conviction. Can they find out what happened to the victim and locate the true perpetrator?