Alfred Hitchcock takes Selwyn Jepson's novel, preserves all the thrills from the page and adds a dash of his own. Eve Gil (Jane Wyman), a drama student studying in London, learns that a friend, John Cooper (Richard Todd), has been implicated in the death of the husband of his lover, actress Charlotte Inwood (Marlene Dietrich). John has a plan to prove himself innocent, but needs Eve's help, not to mention her talent. Can they pull it off?