Leo Marks himself is a legend both as a cryptographer and as a scriptwriter. His most famous work, Peeping Tom, a terrifying thriller about a killer obsessed with photographing the fear on the faces of the beautiful women he is about to murder, is a cult classic of 1960s cinema.
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Between Silk and Cyanide presents the memoir of the man who transformed code-making and code-breaking for the Special Operations Executive in World War Two. Leo Marks later went on to become an award-winning scriptwriter.