The film is about a high school tech whiz (Laura Marano), who is determined to become prom queen. But on the big day, she suddenly wakes up having a bad hair day, and her destroyed prom dress, and everything that can go wrong, does go badly wrong. A police officer (Leigh-Allyn Baker) seeks the necklace that the teen somehow ends up possessing. Prom day goes really bad as the pair is pursued by a dogged jewel thief (Christian Campbell) on a wild ride cross around the city.
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.