After a 22 years marriage, a couple shows the signs of a crisis. She thinks he has a lover, and it actually seems so, but does the other woman really exist?

Marguerite receives as a gift from a filmmaker friend: a very modern, automatic camera, complete with remote control. Her life will change dramatically, as the machine reveals to her not only her husband's betrayal with her best friend, but also the desolation of her own existence.

A middle-aged antiquarian's husband leaves her to go live with her best friend.