One on Top of the Other (1969)

This movie, also known as "Una sull'altra," is a giallo film directed by Lucio Fulci. The plot revolves around a man accused of killing his wealthy wife to inherit her fortune. As he works to clear his name, he uncovers a web of deception, betrayal, and murder. The suspenseful story is filled with twists and turns as the main character delves deeper into the mystery surrounding his wife's death.