Four year ten students-Jake, Felix, Andy and Sam-are grouped together during a school orienteering excursion at the Bremin Ranges National Park and get lost. After getting caught in an unexpected storm, the boys spend the night in the forest. When they return home the next morning, the boys get chased by a furious tornado and discover that some strange things have happened; Felix's disabled brother Oscar can walk, Andy's sister Viv owns his room, and Jake cannot get into his house.