A long-term couple who are in an erotic slump decide to bring a breath of fresh air into their relationship by having a ‘foursome’ with two friends. But the open-minded meeting takes an unexpected turn and ends in a fiasco.

2007: 17-year-old Karl lives with his single father Werner in a cramped flat in an East Berlin apartment block. Karl's eight-year-old brother David is in a sheltered housing group. Karl feels overwhelmed in his contact with his little brother, because David looks to him for what their 62-year-old father cannot provide. After their father's birthday, something unexpected happens: Karl lays an egg. He tries with all his might to keep the hatching creature alive.