When Helen Jones comes home from walking her dog she finds an intruder in her house. The intruder escapes, but not without Helen recognizing him as her long lost husband Alan, who disappeared with a lot of his employer's money. Only Alan does not look a day older than the day he disappeared. David and Vernon Scripps help a young Frenchman Anton Berail. Berail's father owns a large vineyard and Anton thinks, Vernon's cottage is suitable for growing wine. Sergeant Merton tells PC Bradley and PC Ventress, why he had to leave the CID and become a uniformed police officer. Oscar Blaketon organizes a treasure hunt to raise money for playgrounds and everybody spend a lot of time trying to solve the puzzles. Mike teams up with Tricia Summerbee and they make cupid work overtime.