Lien, Sien, and Fien Kriegel are junior witches. These 11-year-old triplets pester their fellow pupils and teachers as if the Devil himself were on the case. The school psychiatrist decides to stop the terrible threesome once and for all by putting them in an institution. The only way to escape their fate and to stay together is to destroy evil and to teach the Devil a lesson. But the Evil One has personal designs on the sisters...