El Efecto Mariposa on AllMovie

This Spanish-French comedy set in South London seeks to demonstrate that human relationships provide an excellent example of chaos theory. Featuring a bilingual cast, the story centers on Luis, an introverted bookworm who travels to London, accompanied by his overbearing mother, to stay with his aunt Olivia. Olivia has a tempestuous relationship with a handsome television actor, Duncan. Her child belongs to him. With all these people together under one roof, the situation in the apartment is quite chaotic. However, Luis' mother eventually goes back home and Duncan, who is caught philandering at a party, gets the boot. Soon Luis and Olivia are having a torrid affair of their own until his mother returns and causes all sorts of trouble.