It's Christmas Eve at Valco and Gavin has set his sights on smashing the record for the highest-ever Valco takings. Despite Margaret massively misjudging the meaning of 'secret Santa', the tills are ringing and the staff are gearing themselves up for a major blow-out at the Christmas party. Gavin has even found a kindred spirit in new star employee Tim. Best Valco Christmas Eve ever.

But as the festive fun kicks off in the canteen, all is not well. A hapless team of criminals have got into the store and are planning to nick the takings. When their plan goes wrong, they round up all the staff and hold them in the canteen. Well, not all the staff. Unknown to them, Gavin is still on the loose. Can he save the day?