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Crime novelist Robert Southley (Hugh Sinclair) has a fondness for basing his books on his own experiences. This means that Southley has to maintain underworld connections, and it is this that leaves him vulnerable to blackmailer Fenton (Michael Brannon). Adopting a disguise, Southley kills Fenton -- then has enough cheek to help Inspector MacDougall (John Laurie) track down the "unknown" killer. Barry Morse, better known as Lieutenant Gerard from TV's The Fugitive, is featured as MacDougall's assistant. No Trace was written by Robert Baker, an old hand at gimmicky murder melodramas.