Katie has a secret -- her four best friends are fairies! They need to save the magic oak that connects the fairy and human worlds. Each book brings them closer to completing this important fairy task! When Katie accidentally leaves her new dollhouse outside overnight, she's in for a surprise. By the next day, four fairies have moved in! They've come for a reason: they must save the magic oak tree that connects the fairy and human worlds. And they need Katie's help. But when Katie's mom tells her she must bring the dollhouse inside, the fairies get crazy. Katie will need to clean up the mess and convince her mom to let the dollhouse stay outside where the fairies are happy. Only then will they will be able to get to work on completing their important fairy task!