Martha overhears Bernard and John talking about blackmail. Jacob has come up with a plan that includes a mysterious key. Brothers Bobby and Arnold, eternal rivals, both fancy Martha, but also have a soft spot for Leonie. The latter gets tasked to learn more about Jacob's plan. A dead man is discovered lying in Bernard's office late at night by somebody else searching the premises. When the main conspirators all gather at the Zevenhuis villa, John declines to cooperate...

In this debut comedy by director Erik Terpstra, an ordinary middle-class gentleman picks up a colorful but degenerate and no-good beatnik/hippie hitchhiker and inexplicably invites him home to meet the wife and kids. The resulting conflicts between the hitchhiker, who respects no rules or boundaries, and the family, provide the substance for most of the humor in this sincere but not especially well-thought-out film. Reviewers who saw the film at the 1967 Mannheim Film Festival expressed the opinion that it was an unformed work by a promising talent.

When the police picks up a suspicious man carrying a knife, he appears to be suffering from amnesia. They send him to a special hospital to put him under observation. There, the man begins regain snippets of memory and starts to do some investigating of his own. Unfortunately, he also appears to be suffering from hallucinations which hinder his progress.