The graded readers series of original fiction, adapted fiction and factbooks especially written for teenagers. Katy is reluctantly at a children's camp for the summer. She thinks she's too old to be with a hundred strangers. But soon it becomes clear that something strange is happening to the other children at the camp. What is it? And why aren't Katy and her new friend Riley affected? This paperback is in British English. It is also available with a CD-ROM/Audio CD with vocabulary games and complete text recordings from the book.