Hanni and Nanni have gone one step too far this time. It all began as no more than a bet, but culminated in a wild chase through a luxury department store. As a final straw, the two girls were even accused of theft. The twins are expelled from school and their parents send them off to a boarding school called "Lindenhof". A whole new life begins. While good-natured Nanni soon makes her first friends, hot-headed Hanni has much more trouble settling in. The first crucial test comes when the "Lindenhof" hockey team is due to play against the JoCats, the muchloved team from their old school - Hanni and Nanni have to decide where their loyalties lie. An unexpected discovery helps the two of them to choose. When "Lindenhof" also faces danger, it finally becomes clear to Hanni and Nanni that this is where they belong. They cook up a bold plan to save the school...