City of Golden Shadow (Otherland, Volume 1): Tad Williams: Books
While investigating a bizarre illness that is affecting children, several people from wildly varying backgrounds find themselves in danger. They must work to save the children and themselves from a shadowy organization called the Grail Brotherhood. (This book does not stand alone - have volume 2 on-hand when you near the end...)
This is a great series--utterly engrossing! I wish there had been more books in it--they were such a pleasure to read!