Fourteen- year-old Bobby Pendragon has it all; he's smart, popular, and a star basketball player in quiet Stony Brook, Connecticut. But a visit from Uncle Press soon topples all of that as Bobby learns that he is a Traveler, someone who can ride "flumes" through time and space.

When a mysterious plague threatens to wipe out the inhabitants of Eelong, fifteen-year-old Bobby Pendragon must decide whether to risk getting the antidote and, thereby, endangering himself, his friends, and the future of every other being in Halla.

Fourteen-year-old Bobby Pendragon is not like other boys his age. His uncle Press is a Traveler, and, as Bobby has learned, that means Uncle Press is responsible, through his journeys, for solving interdimensional conflict wherever he encounters it. His mission is nothing less than to save the universe from ultimate evil. And heś taking Bobby along for the ride.

Each of the Travelers returns home to learn the truth about their origins before being reunited for a final, ineveitable confrontation with Saint Dane, whose efforts to control Halla are destroying its very foundations.

"They came from the sky parachuting out of military helicopters to invade Tucker Pierce's idyllic hometown on Pemberwick Island, Maine. They call themselves SYLO and they are a secret branch of the U.S. Navy. SYLO's commander, Captain Granger, informs Pemberwick residents that the island has been hit by a lethal virus and must be quarantined. Now Pemberwick is cut off from the outside world. Tucker believes there's more to SYLO's story. He was on...

Eight boys and girls compete for a spot on the space voyage that will search for a source to solve Earth's energy crisis.

"When supernatural phenomenon start following Marcus O'Mara around, he discovers a key that leads to The Library, a place where all the stories of the living and dead are kept that will help him and his friends solve a terrifying mystery"--

With Saint Dane seemingly on the verge of toppling all of the territories, Pendragon and Courtney set out to rescue Mark and find themselves traveling--and battling--their way through different worlds as they try to save all of Halla.

Once again, Tucker Pierce and friends must fight for their lives against the better-equipped SYLO, and they will risk nearly everything to keep each other safe the battle's climax nears.

While Pendragon is trapped on Ibara, Alder returns to Denduron and reluctantly goes into battle again, and other Travelers face obstacles of various sorts, Saint Dane gains the power he seeks on Second Earth and makes his push to destroy and rebuild Halla.