Twelve-year-old Wendy is enjoying a beautiful hike in Joshua Tree National Park with her older sister and a friend, and her dog, Marshmallow. At least, she is trying to enjoy it. The older girls are in a hurry, while Wendy wants to stop and look at every plant and vista. Then, Marshmallow darts after a critter. Wendy chases him--and soon realizes they are lost. Alone in the Mojave Desert, Wendy faces blistering temperatures, a deadly snake, and the challenges of finding food and water. She must use her wits to recall facts about the desert that will keep her alive until her rescuers come . . . but will they find her in time? This exciting fictional adventure will have readers cheering for Wendy to stay strong.