As a terrible thunderstorm rocks Aidensfield, Merton and Bellamy investigate the murder of a retired policeman who was about to flee to Spain with his sister-in-law, whilst Jenny starts behaving oddly after realising the strain that comes with being a policeman's spouse. Meanwhile, Vernon is convinced poker is his game, but he ends up gambling away Greengrass' old truck when he makes the mistake of challenging Rosie's uncle, a professional hustler. A rematch results in him losing his and David's profits, causing Rosie to recruit an eccentric relative to teach her gambling uncle a lesson.