Comedian Tommy Trinder plays it straight in this tribute to the wartime AFS (Auxiliary Fire Service). The dedicated band who kept the fires of London under control during the blitz and fire bombings of WWII.

For ten years, The Terror has laughed at both police and public. And for ten years, two of his erstwhile associates, Joe Conner and 'Soapy' Marks, have plotted revenge on the mastermind whose double-crossing sent them to Dartmoor prison without their share of the bullion stolen in a daring raid.

Divorce barrister Logan arrives back in London from a trip overseas to find the whole city fogbound. Unable to reach his flat, he books into the exclusive Royal Parks Hotel. Leslie sweet-talks Logan into letting her stay in his suite, and although the pair are attracted to each other, the night passes innocently. On arriving at Chambers, Logan is asked to act as counsel for Lord Rockburn, who is seeking a divorce from his wife. Logan accepts the brief, but then discovers to his horror that Lady Rockburn was a guest at the Royal Parks Hotel ball the previous night, and a cornerstone of the case is alleged impropriety after a maid observed a man leaving her room that morning......

Charles (Henry Hewitt), Joseph (Ian Fleming), and Sir Benjamin (John Charlton) are in love with Maria (Dodo Watts), and Lady Sneerwell (Anne Grey) is in love with Charles.