Gravity. The Alex Cave Series Book 4

Geologist Alex Cave receives an urgent message about an unusual geologic event in Iceland, when giant globules of molten rock are floating up out of an ancient glacier.

Alex and his friend Okana descend deep into the lava tube of a dormant volcano and discover a 180-million year old alien artifact of incredible power, but before he can take it to a safe location, it is stolen by Janice Sloan, a ruthless woman dealing in stolen advanced technology. When she turns it on, the device begins changing the orbit of the moon and dragging satellites from the sky, but it won’t shut down.

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