A German man is convicted of conspiring against the United States, and his daughter is upset about it. So, she goes about her usual business of getting drunk with her friends, and one of those friends has brought along a nice gentleman who our heroine gets along splendidly with. But, wouldn't you know it, he's a federal agent, and he's there to recruit her for an undercover mission in Brazil. She eventually agrees to go along with it, and the two of them fall in love in Rio. Then, they find out that her assignment involves cozying up to some old guy who used to have a crush on her. This puts a serious crimp in their relationship.
There's nothing terribly special in the acting, but it's an interesting script, and there's some fantastic visual work by Hitchcock. It's a strange sensation to be caught up in the suspense of a movie without particularly caring about the characters.