Despite a premonition of danger and feelings of personal conflict with her boyfriend, Brad, Sarah Davies is determined to enjoy her family's reunion during the Fourth of July weekend. But the festive atmosphere just outside of Bearsfield, Idaho, turns tense when five-year-old Joey, a boy who suffers from severe autism, disappears from the picnic site.
Sarah and her friends join the emergency volunteers to search for Joey before an unexpected summer thunderstorm breaks loose. Joey, partially deaf and driven by fear, doesn't realize danger, and he's running scared. Undeterred, Sarah and her friends, Meagan, Brad, and Ali search relentlessly. They find clues that lead them deep into a forest and eventually to the consuming river of raging waters.
None of them are prepared for the dangers or the challenges that await them, and nothing scares them more than the fear that they won't be able to get to Joey in time.