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Clue of the Silver Key is a 1961 British second feature crime film directed by Gerard Glaister and starring Bernard Lee, Lyndon Brook and Finlay Currie. The screenplay was by Philip Mackie based on the 1930 Edgar Wallace novel of the same title. It is part of the series of Edgar Wallace Mysteries films made at Merton Park Studios from 1960 to 1965. imdb.com