Eoin McNamee brings his cast of characters from "The Navigator" back for "City of Time." Cati, Owen and Dr. Diamond return and they have a daunting task: to stop what appears to be the world's inevitable end. As readers may recall, in "The Navigator" the evil force known as the Harsh attempted to destroy time. That is until Owen and the Resisters saved the day. This time around, the moon seems to be moving perilously close to the earth, wreaking havoc on nature's cycles. So, McNamee's team travels to the book's titular city (where time is literally for sale) to see what they can do to ease fears. McNamee, who lives in Sligo, is perhaps best known for his book "Resurrection Man," set in Northern Ireland and later made into a movie starring Stuart Townsend. This time around, in "City of Time," the adventure is quite a bit more child-friendly, but no less imaginative. ($16.99 / 336 pages / Random House Children's)