There is a chance for the free Hork-Bajir on Earth to start their own rebellion against the Yeerks. They have the numbers, but they don't have the weapons. And they've learned from the last surviving Arn -- the race that created the Hork-Bajir -- that Aldrea, daughter of Prince Seerow, knew the location of a stolen Yeerk vessel.

Unfortunately, the only way to recover the ship is to ask Aldrea herself -- and she's dead. But the Arn has Aldrea's persona stored. And Cassie, Rachel, or Toby Hamee are the closest match. The only problem is that once Aldrea gets into one of their minds, she may not want to come out...