Their continued survival in a universe filled with races ready to destroy anyone perceived as different is based on the Rules. And first among those Rules is: Never reveal your true nature to another being. But when the youngest among them, Esen-alit-Quar, receives her first independent assignment to a world considered safe to explore, she stumbles into a trap no one could have anticipated.

Her only means of escape lies in violating the First Rule. She reveals herself to a fellow captive―a human being/ While this mistake might not ordinarily prove fatal, the timing of the event could not be worse. For something new has finally made its way into the Universe, the Enemy of the Web, bringer of death to all forms of life. And the hunt it about to begin.