Kaitlyn and her father are camping out in Glacier National Park. Kaitlyn hears some eerie howling at night, and the next day, they find signs that wolves may have been in the area. But wolves were thought to be extinct from the park. That night, they hear more howling, and discover a family of wolves outside their tent. Ruby level titles give readers the variety they need to become confident and successful readers, using a range of characters, topics and text styles keep children engaged and encourage discussion. PM Plus Chapter Books (levels 25–30) provide a selection of stories chosen for their broad range of content, characters, topics and points of view. The high-interest topics include adventure, emergencies, natural disasters, risk-taking, historical events and investigation. #pm19-offer