Two armed robbers hold up a train just outside Aidensfield while a third robber threatens Quinn, the man at the signal box, into stopping the train so that his accomplices can make off with £200,000. Quinn tries to stop his attacker causing both him and the robber to be injured by a gun shot. A mysterious woman turns up at the Aidensfield Arms and asks for Claude Greengrass and David is very surprised to learn that she is his sister Bella, whom he has not seen for 22 years which is still much too soon for him. Mike and Jackie have set the date for their wedding. They want to keep it a secret, but soon the news is out all over Aidensfield. Yet Mike nearly does not make it in time because he stumbles over the injured train robber.