"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.

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.

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.

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.

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.

Having escaped from Pemberwick Island, Kent, Tori, Olivia, and Tucker continue to try to get word out about SYLO, the organization that had quarantined them, while trying to avoid being caught in the middle of an inexplicable new civil war.

Sixteen-year-old Marshall Seaver is expecting a boring summer when his best friend goes away, but instead he finds himself haunted--and hunted--by ghosts that want something from him which he cannot decipher.

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.

Cooper Foley, who has a knack for getting into trouble, ends up in the middle of a border war between the worlds of the living and the dead, trying to find out about the mysterious Morpheus Road.