The first manned trip to Pluto discovers some fascinating and alarming information. A trip to Pluto uncovers information that changes science and human history as we know it.

Aboard a human city ship headed for Proxima b, shadows begin to haunt the sleeping passengers. An engineer commits suicide, and a psychotherapist finds that these apparitions feed on human guilt. The only way to survive is to master and confront the mounds of guilt that each human passenger carries inside herself.