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Nigel Dennis (Dennis Price), a tabloid magazine publisher, makes a fortune blackmailing high-profile politicians and celebrities with the threat of publishing their dirty secrets. After his latest two targets die, Dennis sets his eye on a new set of celebrities, including Sonny MacGregor (Peter Sellers), a smug television host, and Flora Ransom (Peggy Mount), a writer. However, the latest group decides to join forces and concoct an elaborate plot to murder Nigel.