Target Earth continues the story from "When Time & Reality Collide". The battle on Anthos with the Arkons was a long time coming. Samantha and Zeke are now on their way back to Earth. But their first stop at the Mars Base uncovers a serious situation. Long ago, a widely dispersed idea made it difficult for the guardians to recognize, but now pieces have started to become evident. A major conspiracy activity on Earth is suddenly discovered by the Sentients which becomes a highly problematic matter. The Council is caught off guard and now they must develop a plan to thwart the threat to the Alliance. Zeke is deeply involved in security, and he has to help organize a strategy to confront the pending assault force. Samantha is directed to go to Earth to uncover as much information about the conspirators as she can. At all costs she must avoid being discovered and remotely locate those involved. This time Sam is put right in harm's way with limited support. It's a mystery who can be trusted and who is who they say they are. There are many active participants in this mission, but only a few key players who must be stopped.