It starts with a misunderstanding. When Pekka, the class goofball, tells everyone at school that his mean coach kicked him off the team, everyone thinks he’s talking about hockey. However, it was a water polo team that he got kicked out of. Pekka just forgot to mention that. The only problem is that Timo has a brilliant idea: their own hockey team, the "Knights of the Night," should show Pekka's old team what they're made of! Now, a hockey team and a water polo team must compete against each other. Normally, that wouldn’t work at all, but with Ella and her friends, it’s going to be a real spectacle. A lot of humor and true friendship make the impossible possible once again in this children's book.