A woman convinces her lover to kill her husband. The husband suspects his wife to be unfaithful because loses a piece of jewelry (bracelet, pendant?) at the lover’s house. The lover supposedly kills the husband but the woman is haunted by a sound of a broken car horn eerily reminiscent of the sound the horn of her husband’s car used to make. She begins to go crazy over the signs her husband might be back from the grave. In the end, it turns out her husband is alive and he manipulates her into killing her lover. The husband then commits suicide in prison. The final scene shows her in a wheelchair, catatonic. A child drops a ball to her feet and she apparently is finally able to go out of her catatonic state and reach for the ball.

This is most likely a 1980s or early 1990s movie. I would guess French or Italian (not sure about this, though).