Blaketon is left to ponder his future as his retirement from the force draws closer. However, he is unable to worry about the end of his career when a recently paroled criminal hatches a plan to use his son's love of trains to perform a robbery job on a fur factory where his wife works, setting in motion a chain of events that lead Nick into a dangerous chase with a train. Meanwhile, Greengrass thinks he's finally struck gold after finding some old Roman coins while working as a gardener and sets off to find more.

It's the day of Nick and Jo's wedding, and wedding fever has struck Aidensfield, even Greengrass and Blaketon are doing their bit for the big day. Seeking peace and quiet, Nick sets off for a ride in the country before the nuptials, but disaster strikes when he comes across a dangerous domestic dispute and is left stranded in the middle of nowhere with an injured man. Can he save a life and make it down the aisle in time?