A sexy beauty hired as a hit woman to break up a diamond heist and recover the booty, Modesty Blaise (Monica Vitti) is considerably more mod than modest. As brainy as she is beautiful, she soon discovers she has been set up by a combination of governmental and villainous forces. Fortunately, she possesses the uncanny ability to change her appearance in the blink of an eye, making her the envy of the fashion world as well as the spy sector. Assisted by the only man who can truly satisfy her, Willie Garvin (Terence Stamp), Modesty battles the evil Gabriel (Dirk Bogarde) and Mrs. Fothergill (Rosella Falk), along with numerous other villains, in this adaptation of the comic book by Jim Holdaway and Peter O'Donnell.