A high-stakes drama set in the world of gambling, where a clever but morally conflicted roulette player, Alex Joski, joins forces with a desperate woman battling debt. As they pursue an “unfailing system” to beat the casino, their alliance is tested by jealousy, mistrust, and the reappearance of the woman’s troublesome former lover.

A young physician becomes lonely when his workaholic wife ignores him to concentrate on her professional career. He is befriended by an older female artist who is fond of hallucinogenic mushrooms. When his wife is late for their anniversary celebration, he drinks and takes mushrooms with the artist. He wakes up to find she has died and is fearful he may have accidentally killed her.

In Lausanne, Léon is involved by accident with a small Leninist group and gets to know Léa, a dedicated activist and the group leader's mistress. The police keep a close watch on them and trouble is bound to follow.