In the foreseeable future, humanity is tired of frightening itself with global disasters and wars. But just when world history seemed to have replaced revolutionary leaps with a smooth pace, the unshakable order of things collapses with a terrible roar under the onslaught of a cruel enemy emerging from an unknown abyss. The world is threatened not by the notorious alien humanoids, but by distant relatives of the earthlings themselves. But is it only a visible enemy that people have, and how will the heroes and all of humanity have to change in order to take the right step from the edge of the abyss?