A former race-car driver-turned-writer decides to expose a ruthless, womanizing Grand Prix race driver in a book. However, his scheme explodes when his life is saved by this man, who turns out to be actually sensitive and misunderstood.

Joe Machin is a racing driver and is determined to win the Monaco Grand Prix. In his private life, he behaves morally in a not very catholic way, cheating on his wife with the girlfriend of another racer, Steve, and using his brother as an alibi. But this time Steve also comes to Monte Carlo, to write a biography on Joe.