City of Time by Eoin McNamee
The second book in the Navigator Trilogy is quite good. I wondered, where else could this series go? In this book readers learn more about Owen and what being the Navigator means, and how time works in this world. The cast of characters is much smaller than in The Navigator, and we are in another world of time! Here is the abstract from the card catalog: "When he receives the cryptic message that "time is running out," Owen, known as "The Navigator," summons Cati and Dr. Diamond and together they journey to the City of Time in order to discover what has gone wrong. " Check out the ;ublisher's website if you haven't yet: http://www.randomhouse.com/kids/catalog/display.pperl?isbn=9780385735544