Demon Crown (#13) by James Rollins

Off the coast of Brazil, a team of scientists discovers an island where all life has been eradicated by a species beyond imagination. Before they can report their discovery, a mysterious agency attacks the group, killing them all save one: an expert on venomous creatures, Professor Ken Matsui.

This inexplicable threat traces back to the terrifying century-old secret buried beneath the National Mall: a cache of bones preserved in amber that was hidden by a cable of scientists-led by Alexander Graham Bell-to protect humankind. The object also holds an astonishing promise for a future: the very secret of life after death.

Now an ancient horror-dormant in the marrow of those preserved bones- is free once more, nursed and developed into a weapon of incalculable strength and malignancy, ready to wreak havoc on an unsuspecting world. Commander Grayson Pierce will be forced to make an impossible choice. To eradicate this extinction-level threat and expose those involved, he will have to join forces with Sigma’s greatest enemy- the newly resurrected Guild-even if it means sacrificing one of his own.