Shadows in an Empty Room (1976)

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.

Directed by: Alberto De Martino

Starring: Stuart Whitman, John Saxon, Martin Landau, Tisa Farrow, Carole Laure, Jean LeClerc

Links: IMDb, Movie posters, Movie stills