This book is volume two in the Doorways series. Rigil Kent follows the events of Origins and the evolutionary reset. Survivors, clinging to life, try to rebuild under the seemingly omniscient gaze of an alien enemy. A single outpost prepares to launch a counterattack armed only with their intellect and a data pack with the accumulated knowledge of a post-singularity society. But before they can take the fight to the enemy they must deal with their own demons of ego and ethics. Meanwhile, a lone AI returns to Rigil Kentaurus, bringing a copy of the data pack. But deep space carries the threat of nihilism and madness. Crossing the gulf between the stars is a desperate move. Will the comet team even be there when she arrives?