Knocked out of orbit by a rogue comet, the asteroid, Vesta, rockets towards Earth, to pass by in a heavenly display of fire. Dubbed the party of the century by the media across the planet, thousands gather in cities to watch the spectacle and party until dawn.

A miscalculation sees Vesta crash into Earth and vaporising the Greenland and Arctic ice sheets.

The world is devastated. A wall of water smashes its way through low-lying coastal cities, while a sonic blast of wind destroys almost everything in its path. Mankind is plunged into the stone-age as the power grid collapses with the onslaught of nature.

With the devastation, a new terror emerges. Awakened from their centuries long slumber, an ancient species of humanoid stalks the abandoned transport network beneath the streets of London.

Lexi Keely—an Australian traveller, and survivor—is captured to be used for the monsters’ pleasure.

Armed with the barest of weapons, and a group of other captives, she enacts a plan that will save all, or leave them for dead in the obsidian darkness below the great capital.