International man of mystery Diabolik and his sensuous lover Eva Kant pull off heist after heist, all while European cops led by Inspector Ginko and envious mobsters led by Ralph Valmont are closing in on them.
Belle Duke, in order to get revenge on her former lover Philip Bang, organize his jail break. But instead of Philip is the Italian Felice Brianza, AKAS Felix, to escape. Now Felix is obliged to help Philip to escape. He will succeeded and from that moment on the two will join to defraud Belle. The swindle plot become more complicate when Felix falls in love for Philip's daughter.
When his wife wants a divorce -- in preference of a romantic Frenchman -- husband Livio seemingly accepts. But when he sets up a last weekend together with his secretary and his wife's lover, the trip turns out to be part of an elaborate plan to win his wife back.
