Once there were two terrible twins called Holly and Sean, who gave their Head Teacher a nervous breakdown. The twins were extremely pleased with themselves. That is, until the new Head Teacher arrived. For you see, the new Head Teacher was - a Troll. That's right.And this Troll Head Teacher soon created all kinds of mad new rules for the pupils and teachers. Can Holly and Sean save the day and stop the Troll from eating their classmates and teachers? Can naughtiness be restored to its rightful place? Will Brussels sprouts and peanut butter be taken off the menu?