Josie is acting Sub at her new station and supervises a shout involving a crashed lorry and some hot tar. Tow workmen are injured - one sprayed with molten tar, the other lying beneath a propane cylinder. Blue Watch arrive on scene and have to take their orders from Josie. Tate watches with pride as she organises the rescue of the two men and the immediate evacuation of the area. Blue Watch are then called out to a night fire in a ship's engine room. The hold is already full of foam when they learn that the Chief Engineer is still down below. Malcolm leads his team down on a perilous mission because the foam means they cannot see or hear anything. Everything has to be done by touch. Eventually they resurface with the injured engineer. As a break from playing practical jokes on Colin, Blue Watch decide to do up an old car for Maggie who has passed her driving test at the sixth attempt. They park it in the station yard, to the horror of ACO Bulstrode who is making an official visit. Malcolm tells him it is for practising drills for RTAs. Bulstrode asks to see a demonstration which involves the removal of the car roof. Kevin has to tell Maggie that her car is now a convertible.
