The nuns persuade Mayor Wöller to perform at the charity gala in a duet with sister Hanna. But then Wöller disappears without a trace. In high school there is a dispute over the dress code. Mother Superior wants to resign.
The shop with the snack in the monastery is booming. Even at a film premiere in Munich, the nuns are responsible for the catering. Hanna tries to give new life to a student. Wöller threatens to withdraw a donation pledge.
Sister Hanna founds a citizens' initiative to take action against the planned military base. Secretary Laban and friend Huber convince Wöller that it is good to be great-grandfather. A desperate mother asks Hanna for help.
Nora Gassinger seeks advice from Hanna, because the parent-child center "mouse" is due to complaints from the residents before the end. Mayor Wöller suspects signature falsification on the purchase contract.
An escaped horse to be killed, gets lost in the monastery yard. The nuns try to save the animal. Mayor Wöller wants to turn the monastery into a Bundeswehr barracks. Felicitas is taking driving lessons recently.
The final decision on the location of the new barracks is pending. Sister Hanna tries to help an elderly lady to keep her dog. The nuns' appearance at the charity ball does not seem to be welcome.