Veneno (1952)

Hugo works in a glass industry, and loves his wife Gina passionately. She, on the other hand, shows complete indifference to her husband, and Hugo becomes obsessed with the idea that his wife hates him. He has horrible nightmares, during which he sees himself killing Gina. Each dream always ends with a ruthless police officer interrogating him. Hugo begins to blur dream and reality after he is approached by the same police officer from the dream, who comes to ask if his house hasn't been burglarized. He becomes increasingly involved in a vortex that leads him to poison Gina, committing an almost perfect crime.