Mauvais Sang (French pronunciation: [movɛ sɑ̃], Bad Blood), also known as The Night Is Young, is Leos Carax's second film.

A woman hires two men to steal the serum, which has been locked away in a pharmaceutical company's offices.

In the Paris of the not-too-distant future, a mysterious disease, STBO, is killing people who have sex without emotional involvement.

Marc recruits Alex, a rebellious teenager whose father worked for him before his death.

The soundtrack includes music by Sergei Prokofiev, Benjamin Britten, and David Bowie.