HM (and his singing lessons) snookers GI Masters when the Cavalier's Cup at Telford Old Hall is the center of much activity but no robbery. Elaine, an MP, American Congressman Harvey, two butlers, Virginia and her husband Tom, plus HM's singing teacher cock-a-hoop through the farce (Mr. Dickson been seeing too much of P. G. Wodehouse lately?) which locates the real object of the mysterious doings. Awf'ly tricky.