Léo is a serial killer who lives out of his car, producing music that he plays on the car radio while he works for a ride service.  One day, Léo drives Amélie, a deaf dancer and is frustrated that she doesn't respond to his music. He increases the volume throughout the ride until she can feel the vibration and rests her ear on the windowsill, seeming to enjoy it. Never having felt attracted to someone before, he tries to learn how to engage in a romantic relationship with a woman with...mixed results.