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.

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