Archaeologists Pippa Quinn and Charlie Jackson find advanced technology in undisturbed 16th-century graves. A portent, the discovery precedes thousands of giant sinkholes opening up across the globe as extreme weather threatens the population. Charlie suspects the two are related.
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Destroying the croatoan's seat of power has grave consequences. Earth faces destruction unless bitter enemies can work together. Earth is recovering after Denver and his group managed to stamp out the immediate alien threat. Now Denver and his team, stationed in a liberated croatoan farm, plan to restore humanity as the dominant force. But when shocking information comes to light, they set off on an immediate mission north.