The twins Cosmo (André Lewski) and Carmen (Sandra Tirre) return to their former childhood home for the first time in 15 years. While Carmen attempts to come to grips with her childhood traumas, her efforts are met with resistance by her brother, who brings along his new girlfriend Marie (Hannah Prasse). After Carmen secretly watches the pair's unsuccessful sex attempt, she offers Marie couples therapy. However, due to their inability to speak openly with each other and the arrival of the mysterious new house resident Heins (Heiko Pinkowski), fateful events are set in motion that allow boundaries to be crossed and old wounds to reopen ...