Mrs. Sommer has had a few mice run over her liver. She has declared war on them. In the end, there are no winners or losers, yet everyone is satisfied. Mrs. Sommer enjoys living in the countryside. She has only one problem: mice have moved into her house. And because Mrs. Sommer's home is very cozy and her pantry is well-stocked, the mice have decided to stay. This annoys Mrs. Sommer. She tries by all means to get rid of the pests. But not even a young kitten can drive the mice away. Eventually, Mrs. Sommer moves into an apartment in the city. There are no mice there, but not much else either. Mrs. Sommer feels lonely and longs for her garden. One day, while watching the birds in the park, she has a brilliant idea: the mice don’t need to move out; they just need to relocate, and then there will be enough space for everyone.