Four Murders Are Enough, Darling(1971)

Overview:

Two criminal gangs are ruthlessly fighting for a 1-million dollar check that, purely by chance, got into the flat of shy high school teacher George Camel. As the number of victims sharply increases, Camel is mistakenly regarded as a mass murderer and cunningly uses his horrifying reputation to get the respect and heart of his beloved Sabrina, a journalist from a local newspaper. But this game turns out to be risky and in the end, both gangs don't hesitate to seize the check at all costs, including an improvised operation