Joyce is planning to go off with Johnny Lupus for a 'dirty weekend'. Her car breaks down and Johnny starts trying to fix it. Then Mr Bannerman comes along on his AA bike and insists on helping. Johnny has to hide in nearby woods. Their 'weekend of passion' is ruined. Harry stops to help a beautiful French girl who has broken down. He thinks it's love at first sight, but later realises she's just flirting with him. Pettigrew and Munce find a mysterious car parked in a secluded spot off the road. They think the vehicle must be involved in a crime, but eventually discover that it belongs to a couple who've stopped so that they can go for a walk.