When his parents tell him that they're splitting up and his dad leaves home, a ten-year-old boy begs the sky to help him. The next day, a storm covers Montreal in a deep layer of ice. As the power goes out across the city and the temperature drops, people must help each other in order to survive. The boy is convinced that it's all his fault. Julie, the exotic dancer who lives across the street, helps Boris, an eccentric Russian mathematician, save his fish from the cold weather. And the urbane Michel and Simon open their door to Alexis, their homophobic neighbour. Three days in the frozen city will turn their lives upside down.

Translation of: Le froid modifie la trajectoire des poissons.