On the other side of the street, a woman has moved in. She lives on the third floor, just like Lelio and his father, and everyone can see into each other's apartments. This is how Lelio and Mama Mutsch get to know each other. And that is a great stroke of luck. Because Gunnar, Lelio's father, is often not home, the fridge is empty, and there is no money either. Gunnar is spending more and more time with his buddy Gerd, whom Lelio can't stand at all, and leaves Lelio alone. What is going on? It's no coincidence that Mama Mutsch is a researcher. While she studies the diatom, she also discovers what is wrong with Gunnar. And because she is quite clever on the side, she comes up with an idea on how to help Gunnar transform back into the father he used to be.