When armed robbers hold up a night mail train, Joe pushes his luck when he interferes in a CID investigation led by his old adversary, the incompetent DI Lundlow. With Miller on the warpath and Bellamy exasperated by his attitude, Joe finds an unlikely ally in Rachel when she discovers Lundlow may know more about the robbery than he is letting on. Whilst Ventress and Younger seem to have warmed to him, Joe has a tough challenge gaining an ally in Bellamy. Meanwhile, Aunt Peggy is thrilled when she learns she has been left a legacy by a distant relative of her late husband.