The award-winning Graded Readers series offers a rich selection of original fiction, adapted fiction, and informational books written specifically for teens. This series follows Katy, who reluctantly spends her summer at a children's camp. She thinks she's too old to be among a hundred strangers. Soon, she discovers something strange is happening to the other children at camp. What is the mystery? And why haven't Katy and her new friend, Riley, been affected? This book is in British English. You can download the full audio version of this story and additional educational resources at cambridge.org/experience-readers. Cambridge Experience Readers encourages young people to enjoy reading.