" A swift, gripping novel with a goose-pimple mix of scary science and near-future action." —Greg Bear, New York Times–bestselling, Hugo & Nebula Award–winning author of The Unfinished Land June 30th, 1908—In Siberia's remote Tunguska river basin, the most devastating cosmic collision ever recorded flattens hundreds of square miles with a blast a thousand times more powerful than the atomic bomb dropped on Hiroshima. Yet, more than a hundred years later, the cause of the cataclysm remains shrouded in mystery. Maverick astrophysicist Jack Adler thinks he's figured it out: a submicroscopic black hole, smaller than an atom, more massive than a mountain, made impact with the earth. Jack believes that this fantastic object is still deep inside the Earth, burrowing through its mantle in an orbit that will end only when it has devoured the entire planet. Meanwhile, secret agent Marianna Bonaventure enlists the help of Jonathan Knox, an analyst with an uncanny ability to find hidden relationships between seemingly disparate people and events, to search for three missing scientists and infiltrate the floating headquarters of a Russian industrialist. Together, these three must battle a global conspiracy intent upon exploiting the awesome power of the back hole--a power that can transform the world—or end it. "A swift, gripping novel with a goose-pimple mix of scary science and near-future action" —Greg Bear, New York Times–bestselling, Hugo & Nebula Award–winning author of The Unfinished Land "An action-packed thriller into perilous realms of black hole physics." —David Brin, New York Times–bestselling, Hugo & Nebula Award–winning author of Colony High