Insurance company director Ken Brandon has taken on a mistress, Karin. And it must happen that at the very first meeting, a brutal murder of a prostitute took place next door to their bungalow. Ken turned out to be a witness, but, fearing the publicity of his connection, decided to hide it from the police. However, for every witness there is another witness, and now Ken is being blackmailed by a hippie who saw him and Karin at the murder scene. Brandon decides to open up to the police, putting himself under double suspicion, because this time the blackmailer was brutally murdered...