Jessica loves her yearly backpacking trip with her father, but this year everything has changed. This year Jessica has to share her vacation with her new stepmother and her spoiled new stepsister, Amy. Jessica tries to salvage her holiday by sneaking off for a day hike alone, but Amy follows. Jessica is certain that Amy will ruin the day. Amy rises to the challenge of the rigourous hike and Jessica learns that Amy is not as spoiled as she thought. When Amy is injured and night falls, Jessica must face the challenge of hiking through bear country in the dark.