After her mother's death, the five year old orphan Heidi is brought by her aunt to her grumpy grandfather Alp, who leads a hermit life in the beautiful Swiss mountains. Heidi's natural cheerfulness quickly brings renewed joy in grandfather Alps life. Heidi becomes friends with the goatherd Peter who is about the same age as her and spent two beautiful years in the pasture. But then she is sent by her aunt to Frankfurt in the house of Consul Sesemann where Heidi should get a proper education and upbringing. After some initial difficulties Heidi eventually adjusts to her new situation and makes friends with Clara, the paralyzed daughter of the consul. Only with the strict governess Miss Rottingmeier she keeps getting in trouble. Miss Rottingmeier clearly can not cope with the free and outdoors spirit of Heidi. But Heidi lets a fresh wind blow through the Sesemann house and even causes Clara to overcome her illness.

Peter Hartung, a student at the technical college, just wanted to take his little brother Paul to boarding school. On the way there, his friend Hans Werner tries to persuade him to swap roles. Peter wouldn't dream of going to school for Hans, but only changes his mind when he makes the acquaintance of Christa, who works at the neighboring fashion school. He has no idea that Christa has just broken off her engagement to Dr. Werner, his future literature teacher. The lessons with his jealous ex-fiancé turn into a gauntlet, but this does nothing to dampen the general good mood. Brother Paul also causes a lot of excitement. Not a day goes by without him plotting a prank. Within the sacred school walls, the wildest boarding school comedy since the introduction of compulsory education unfolds - explosions, police action and fire alarms - but principal Dr. Schwabmann takes it all in his stride.

Dr. Oskar Sommer, a good-natured high school teacher, takes on a momentous task for the school janitor, also named Oskar Sommer: he is to play the role of the janitor's daughter's father for a few days. Since the real father has not been seen for 15 years and has pretended to be a teacher in his letters, the two Sommers promptly pick up the wrong person at the train station.

Munich at night: Robert Susmeit, a 16-year-old teenager who is jealously obsessed with his mother Hilde, traces her and her latest lover at a mundane apartment building where he kills the man in the heat of the moment at a swimming pool. His fatal outburst is secretly witnessed by Moni Dingeldey, a girl of the same age as his. Fascinated by the shaken and devastated strange boy who she hopes to be a soul-mate, she hides Robert in her mother's apartment. Meanwhile, a crowd of policemen and reporters frantically comb through the building in search a murderer whose identity is known only to Robert's parents who are searching as well...

Divorced and single bailiff Carla Schön has many problems with her pubescent daughter Eva. However, she cannot use these problems because she has to work in her everyday life. Even in her hobby, orchestral playing, she is absolutely tense. But then she meets the musician Andi Jannings and falls in love with him. He is a dry alcoholic and is in constant dispute with his ex-wife. To make matters worse, he is also a caretaker at Eva's school. Torn between her new love and daughter, Carla soon finds that her next job has to do with Andi. He has money problems and, accordingly, has not made any maintenance payments to his ex-wife.