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Gravity. (The Alex Cave Series, #4)
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Former CIA operative Alex Cave is the only man standing between humanity and extinction — if he survives the descent into the mountain that should kill him.
Cave and his team confront a breathtaking revelation: a gravity-manipulating device left behind by an advanced civilization predating human history. But they're not alone. Treasure-hunter Sloan is determined to steal the technology — even if it means betraying everyone trapped inside the deadly tunnel. As shifting gravitational fields hu...