Boone attempts to track his wife's murderer. He is determined to find out if it was the taelon companion Da'an who ordered her death to get Boone to work for the companions or if it was the resistance that killed her, securing Boone as the resistance's eyes and ears of the companions.

Sandoval's CVI is degenerating. While Dr Belman works to restore his CVI and save his life, Sandoval, free from his CVI, escapes to reunite with his wife, only to put her life in danger. Boone learns that Sandoval's CVI contained information about the Taelon's mission on earth, and tries to save Sandoval's life.

A construction blast unearths a grave marker belonging to a Taelon scout sent to size up earth for Companion occupation thousands of years ago. Boone must find the grave which contains the research, before Sandoval finds the grave. Da'an loses his position as the United Nations Companion to Zu'or, but keeps the American Companionship.

The fate of the earth and the taelons may be revealed when three astronauts from the future are discovered in stasis hidden in a government base.

In exchange for immunity, Sandoval agrees to testify against the taelons.