Season 3, Episode 6:
When police informant Pete MacKintyre returns to the UK for his son's 18th birthday after 17 years on the run, he leads Gerry to fresh evidence about an unsolved armed robbery in which a bank cashier was shot and killed. The police have long suspected the man behind the robbery to be known criminal Ray Cook, now a C-list celebrity and angry to be in UCOS's radar. With MacKintyre's help, Standing recovers a sawn-off shotgun and a microtape, which Lane discovers is the audio of the robbery. The gun is a link to Ray Cook -- but with a watertight alibi of being at his mother's deathbed on the day of the robbery, Cook is proving difficult to nail and even more difficult to track down to interview.