A young couple, Inès and Fred, have just moved into an apartment which has a long hallway. After a few days, Inès hears strange noises and thinks she sees something. Seeking to know more, she is scratched, but she does not know by whom or by what. Fred himself sees nothing and hears nothing. A tension is then established between the two young people who do not understand each other. Is Inès going mad or is it Fred who refuses to face reality?