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In London, famous lawyer Maurice Meister (Wilfrid Lawson) receives a bouquet of flowers with a life-threatening note he suspects is from The Ringer, a murderer and master of disguise. Although The Ringer is rumored to be in Australia, Scotland Yard agent Inspector Bliss (John Longden) and young Detective Alan Wembury (Patrick Barr) discover that the criminal has a reason to be back in London. Complicating the investigation is Alan's engagement to Mary Lenley (Patricia Roc), Meister's secretary. Wikipedia