ELEVATOR TO THE GALLOWS (Louis Malle, 1958)
When Jeanne Moreau looks at the camera as at a lover, there is no need to suspend disbelief. She has you comfortably wrapped around her finger.
She wasn't yet famous when Malle directed her in this, but she already carries herself like a movie star. She takes her allure for granted.
The rest of the film is a little bit all over the place plot-wise, but relaxed about it.