Alberto De Martino’s Blazing Magnum (1976), starring Stuart Whitman and John Saxon, is a violent Eurocrime thriller set in Montreal. Blending murder mystery, mafia corruption, and explosive car chases, it remains one of the cult highlights of the Italian poliziottesco cycle.

Från IMDB:
After his younger sister is poisoned, a tough Ottawa cop embarks on a violent journey through Montreal to find her killer, which turns into a whirlpool of revenge and betrayal.