The story is set on the , where a massive volcanic eruption of Mauna Loa is imminent. However, the natural disaster is complicated by a decades-old U.S. military secret : canisters of a "doomsday" chemical agent—lethal enough to annihilate plant life globally—are buried near the volcano and risk being breached by the lava. The protagonist, volcanologist John "Mac" MacGregor , must lead a team of scientists and military personnel to stop the world-ending event. Availability and "Verified EPUB"