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Insurance investigator Tom Fletcher (Edmund Lowe) is hot on the trail of an arsonist (please excuse the pun). He is helped along by his dedicated assistant John Grayson (Onslow Stevens), and to a lesser extent by Fire Chief Mulligan (Robert Middlemass). Because Fletcher always demands a huge fee for his services, he finds himself one of the suspects in this latest rash of deliberate fires. A surprise plot-twist puts Fletcher and heroine Adrienne Martin (Ann Sothern) on the scent of the real firebug. This modest Columbia production was distinguished by several spectacular conflagrations, all of which quickly found their way into the studio's stock-footage files.