The Navigator is a novel by Eoin McNamee. It was published in 2007 by Random House.
The Navigator is written about the main character, Owen, who finds out that a mysterious enemy is making time go backward. Owen must stop their machine to set things right. Cati is the daughter of The Watcher. She helps Owen defeat the Harsh, a mysterious and deadly species. The only thing that connects him to the other world is his father, which they believe is a traitor. If Owen wants to clear his father's name, he has to embark this journey.