Summary While shopping in a local supermarket, Frank Marker sees an old woman drop (Mrs Stuart) a tin into her bag rather than her shopping basket. This is noticed by another woman customer who reports it to a shop worker. Frank deliberately collides with Mrs Stuart and knocks her bag to the floor spilling out the tin, thus avoiding a possible prosecution. Mrs Stuart invites Frank to her home where he notices an old silver box on her mantlepiece. Meanwhile Gerald Gurney-Stuart (Mrs Stuart's son, played by Barry Foster) is trying to get money for his company. Gerald and wife (patricia) call around to his mother to take her out and end up in the same Indian restaurant that frank is in with his landlady. When Gerald goes back to his mother's home says he will take the valuable silver box away to have it repaired, but he tries to sell it. Gerald's wife Patricia contacts asks Frank to make sure her husband isn't up to no good. Frank finds the Silver box in an antique shop and almost gets arrested by Det. Insp. Fairbanks (Ray Smith), who wants to know why frank is interested in this box. Frank is questioned but released and on visiting Mrs Stuart, finds out that Gerald 'borrowed' it to get it repaired. Frank visits Gerald and thinking Frank is trying to blackmail him and so calls the police and admits to everything.

• Crime
• Drama