A quiet night at the Aidensfield Arms turns into a life or death situation when the pub is targeted by armed robbers, and Nick, Greengrass and George find themselves held at gunpoint in the cellar. One of the robbers, Alec Robinson, appears to be well acquainted with Greengrass, leaving Nick convinced that the old rogue has something to do with it. Meanwhile, Blaketon and Kate make an unlikely alliance in order to gather infomation on the robbers.