This critically acclaimed French drama blends film noir and science fiction elements in a story about a strange and deadly plague. A sexually transmitted disease called STBO is sweeping the country; it's spread by having sex without emotional involvement, and most of its victims are teenagers who make love out of curiosity rather than commitment. While a serum that can treat the disease has been formulated, it's been locked away in an inaccessible government building, and most of those suffering can't get at it. A woman known as "The American" (Carroll Brooks) has hired Marc (Michel Piccoli), who is deep in debt and desperate for cash, to steal the drug; Marc enlists the aid of Alex (Denis Lavant), the teenage son of one of his close friends, to help pull off the robbery. Alex is in love with Lise (Julie Delpy), a girl his age that he's been involved with, but he finds himself attracted to Anna (Juliette Binoche), Marc's younger lover who is determined to stand by her man. Mauvais Sang received the Alfred Bauer Prize at the Berlin International Film Festival and the International Fantasy Film Award at the Fantasporto Film Festival.
by Mark Deming synopsis