Lukas, Pauli, and Flo dream of achieving great musical success. In search of a rehearsal space and a shared apartment, they stumble upon an abandoned school building that is rumored to be haunted. Inside, there is a mysterious attic door that keeps swinging open, creating a draft throughout the house. Behind it await the wildest adventures! Right next to the old school lives the blended family 'WTF': Watt-Thiessen-Fidan. This family consists of psychologist Heike, reporter Almuth, and the children Henning (8) and Romy (13). The latter keeps the entire town updated with her own podcast, 'Hausenheim Hood News.' Your friends and the neighborhood kids quickly become an unbeatable team. While Flo, Lukas, and Pauli find themselves caught up in the most absurd adventures behind the attic door, the 'WTFs' face equally crazy challenges in their not-so-normal family life.