Summary taken from the official site:
Imagine what it would be like to discover you aren't the person you thought you were.
That's what happened to Bobby Pendragon. He was living the life of a normal 14 year old guy, until his Uncle Press came by one night to say: "I need your help." From that moment on, nothing was the same. He and his uncle were swept off on a series of adventures that would take them through both time and space. Their mission? To protect the territories of Halla from a demon named Saint Dane, a cold-blooded villian who wants nothing less than the destruction of all humanity. The only force standing in Saint Dane's way is a mysterious group of people called… Travelers.
Bobby is surprised to discover that he is a Traveler. He has no choice but to band together with the others in their battle against Saint Dane, wherever and whenever it takes them. Trouble is, Bobby would much rather be home playing basketball. But that wasn't meant to be, because when he left home, his entire family vanished without a trace!
Each of the Pendragon books follows a unique adventure as Bobby and the Travelers shoot across the universe in pursuit of Saint Dane. They must match wits with this fiend while doing their best to unravel his wicked plans. But Bobby is also driven by the ultimate mystery: Why was he chosen to become a Traveler? And more important… What happened to his family?
The amazing truth unravels slowly for Bobby over the course of all the Pendragon books. Along the way, he encounters the kind of nail-biting, hairy adventures that he used to love to watch in the movies, but now must live out every day for real.
Has anyone read this series? So far, seven books have been released, with the eighth, "The Pilgrims of Rayne" set to release on May 8th.