A romantic comedy of manners, "Susan Slept Here" tells the tale of Mark Christopher, a successful Hollywood screenwriter struggling with writer's block on Christmas Eve, when his life is turned upside down by an unexpected visit from Sergeant Maizel and the arrival of 17-year-old Susan Landis, a juvenile delinquent brought to his apartment by the sergeant. As Mark navigates this unexpected turn of events, he must confront his own personal demons and the consequences of his impulsive decisions, all set against the backdrop of a festive holiday season.