When a newly licensed youngster crashes his car, Mike investigates a car dealer called Kenneth Marsden after Brian's mother accuses him of selling her son a faulty car. But Mike uncovers a much more serious crime connected with Marsden. Meanwhile, Greengrass inherits racing pigeons when an old friend who owed him money dies. He ropes Bernie and Aunt Mary into forming a syndicate. However, things don't go according to plan and Greengrass soon realises he needs to brush up on his knowledge of pigeons. Elsewhere, Mike wonders what he has let himself in for when he allows Bellamy to move into the police house, whilst Maggie is torn between two men.