The River by Gary Paulsen

In this gripping sequel to a survival adventure, a young boy named Brian is asked to return to the wilderness to demonstrate his survival skills for a government project. Accompanied by Derek, a government psychologist, Brian finds himself once again in the heart of nature, relying on his resourcefulness and resilience. However, when a sudden storm leaves Derek incapacitated, Brian must navigate the challenges of the wild alone, racing against time to save his companion and himself, showcasing the strength of human spirit and ingenuity in the face of adversity.

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