Amazon.com description: Product Description: This award-winning graded readers series is full 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. Download the complete audio recording of this title and additional classroom resources at cambridge.org/experience-readers Cambridge Experience Readers get teenagers hooked on reading.