Demon Crown : a Sigma Force novel

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Those bones encased in amber and buried in the nation's capital by a group of concerned scientists, with Alexander Graham Bell in the lead? Sure, they contain the secret of life after death, but they are also linked to an unimaginable horror from the past that could wipe out humankind. And with their unearthing during a construction project, the horror is out, and Sigma Force must join forces with its very worst enemy-the newly resurrected Guild-to defeat it