Kokusai himitsu keisatsu: Kagi no kagi is the fourth instalment of five films in the "Kokusai himitsu keisatsu" series. The film is a parody of James Bond-style spy movies, and was used by Woody Allen, along with footage from the third instalment, in one of his first films, "What's Up, Tiger Lily?", in which the original dialogue is redubbed in English to make the plot about a secret egg salad recipe.
