Wanting to start a new life, 40-year-old Heli has found an institution in which she can put her younger, mentally disabled sister. Her three egocentric brothers have agreed to the plan and come to share their sister's final weekend at the house where they all grew up on the outskirts of Berlin. They find that the "baby of the litter" has turned into an unpredictable "monster". The fallout brings them closer together than they'd expected.