A young nurse is kidnapped by a group of violent teens who escape from a mental hospital and take her on the road trip from hell. Pursued by an equally deranged lawman out for revenge, one of the teens is destined for tragedy and horrors that will destroy his mind, moulding him into a monster named Leatherface.

After escaping unscathed from a car accident, photo model Simone decides that having a baby is the only way to give her vacant life some meaning. She asks her best friend Philippe to get her pregnant, and he reluctantly agrees, on the condition that they conceive somewhere in a desert, so they leave Montréal on a 24-hour round-trip to Salt Lake City to find a suitable spot.

Louise is living in Montreal, unemployed. Her sister Paulette often gives her a hard time. She only gets to see her poetry-quoting married boyfriend Julien once a week. She hangs out a lot at the dance studio in her building... Louise decides to offer an hour of her time to strangers on the street. "An hour of myself", to do whatever they want to do. But one hour precisely, that's it. This leads to many different situations, some funny, some sexy, some sad. Louise talks to someone who later turns out to have been an undercover reporter. The reporter anticipates a bad end for Louise...

4 and a half is the apartment occupied on the Plateau Mont-Royal in Montreal by a young couple. It is a chronicle of the daily life of the urban reality of 25-30 year olds: love, friendship, humor and tenderness.