Abrahams, Tom. Extinction Cycle.

This official prequel to the Extinction Cycle series is the story of Lieutenant Brett who is introduced in the prequel of book 1, Extinction Horizon. For a dozen years, villagers along the ancient Da River in Vietnam have feared a nightmarish creature who hunts and consumes human flesh. Only in whispers do they mention its name, The White Ghost. The ghost is what is left of Marine Lieutenant Trevor Brett, a chemically engineered experiment gone wrong. Now, as he stalks the jungle for prey, the men who made him into the monster he has become are hunting him. His end was just the beginning

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