To amuse themselves during the winter school break, the kids in a small village decide to have a massive snowball fight. Luke and Sophie, both 11 years old, become the leaders of the opposing sides. Sophie and her cohort defend an elaborate snow fort against the assault of Luke's horde. Whichever side occupies the fort at the end of the winter break, wins.

When the body of the executive of hockey Benoit Brisset is found on the billboard of the border of Quebec and Ontario, the jurisdiction of the crime is shared between the two police forces and detectives David Bouchard from Montreal and Martin Ward from Toronto are assigned to work together. With totally different styles, attitudes and languages, the reckless David and the ethical Martin join force to disclose the identity of the Tattoo Killer, a deranged serial-killer that is killing managers of hockey.