 When one of Gerry s informants returns to England and provides him with new evidence, the team re-open the case of a 1987 bank robbery where one of the bank employees was killed. The prime suspect was always Ray Cook, but the police could never get the evidence to charge him. Cook s alibi has always been that he was with his dying mother at the time of the robbery but the team find evidence that brings their basic premise into question. They also determine that the bank robbers may have had inside help, including that of certain police officers.