A drug deal goes bad and the heroin is stolen. One mob boss doesn't have his drugs and the other doesn't get his money. People are going to die until they discover who double-crossed them. Into this backdrop, Inspector Dario Mauri arrives from Milan to help clean-up Naples. His mission – find the drugs and stop the killing.

Heidi leaves her beloved Alm and moves to Frankfurt, where she finds a new good friend in Clara. Aunt Dete wants Heidi to leave her grandfather on the mountain pasture and go with her to Frankfurt, where she is supposed to live with the Sesemann family and keep their paralyzed daughter Clara company. In this way, Heidi would enjoy an excellent upbringing and grow up with one of the richest families in Frankfurt. Aunt Dete sees a bright future for Heidi in the city. However, this idea is not met with enthusiasm by Heidi and her grandfather, Peter and his grandmother are also very reluctant to let Heidi go. After much persuasion and many promises from Aunt Dete, Heidi finally leaves her beloved mountain world with a heavy heart and travels to Frankfurt.