With Craddock away, Ventress relishes in his role as acting sergeant, leaving Bellamy and Mike longing for the return of narrow-minded Craddock. Ventress smells a rat when Tom Lowson, the biggest black marketer in the North Riding area during World War 11, returns to Aidensfield, whilst Maggie clashes with Tom's rebellious daughter over a shocking case of bullying - and illegal abortions. Meanwhile, Greengrass makes a promise to a dying friend, who wants to sell her valuable Georgian clock to afford a holiday at the hotel where she and her late husband spent their honeymoon. Unfortunately, Greengrass discovers her valuables are not of much value and must now come up with a plan to make a dying women's wish come true.

Mike and Jackie's wedding day takes a dramatic turn when he and Bellamy work alongside CID to track down two train robbers. Meanwhile, Greengrass receives a shock when he is reunited with his eccentric sister Bella, whom he has not seen for 22 years. She immediately begins ruling the roost at his cottage, leading to him taking up residency in a caravan on the moors.