Everything started as a game between Eva and Niccolò, a young loving couple living in LA. She is a psychology student and convinces him to subscribe to “US”, a dating app for couples: she needs it for her dissertation. Soon after, Niccolò has to move to Rome to shoot his very first film. His only distraction is the app. He starts chatting with Maria, who seems to be the perfect woman. He falls for her and would do anything for this mysterious woman. She seems to know him, pushing him to face his fears, eventually putting him in danger. When Niccolò begins to suspect her identity, she finally shows who she really is…