German Areta (Alfredo Landa) "The Louse", is an ex-cop detective with a tiny office in a part of Madrid going to seed - a scenario inspired by Dashiell Hammett (1894-1961), to whom Crack is dedicated. Areta is trying to track down a young woman who has basically disappeared into the world of high-class courtesans in the city, and he is told to lay off the search by some powerful types who do not want any negative publicity. Unwilling to leave it at that, Areta' s enemies decide to bring home the message in an unsavory manner, through some nasty business with his girlfriend's daughter. Enraged at their tactics, Areta puts his manhunt into high gear and heads off to New York City to track down the bad guys. In another tip of the hat to Dashiell Hammett the "look and feel" of the film evokes the 1930s mystery movies.
Diana is a Roman wife happily married to sympathetic Paolo but she is keen on playing benign games of seduction with other men while resisting the advances of chic lingerie shop owner Silvio and she narrates her adventures to Paolo in order to stimulate their otherwise monotonous sexual life.
Jack Terry is a master sound recordist who works on grade-B horror movies. Late one evening, he is recording sounds for use in his movies when he hears something unexpected through his sound equipment and records it.