Stony Brook, Connecticut, located in the greater New York metropolitan area. Bobby's Uncle Press reveals that he will train Bobby to become one of the "Travelers": wormhole-journeying young warriors from a variety of different planets and cultures, who are tasked with stopping or reversing the destruction being enacted by the villainous Saint Dane. Saint Dane is a shapeshifting demon whose favorite form is a tall human with icy blue eyes and long grey hair, but who can variously transform into a raven, a cloud of smoke, and a variety of other forms. He plans to destroy "what separates order from chaos"—the very fabric and structure of the universe, known as "Halla"—so that he can rebuild it according to his own twisted design. Uncle Press, the lead Traveler, introduces Bobby to the "flumes": enchanted tubes used by Travelers to journey among the ten "territories", which are especially eventful locations and time-periods in the universe. Press explains that Bobby is a resident and designated Traveler of the territory known as "Second Earth", which means planet Earth (especially centering on New York City) during the early 2000s (the present moment at the time of the series' publication). Most of the novels in the series are structured around a similar basic conflict: as one of Halla's ten territories reaches a crucial turning point, in which its people must make a critical global decision for their future, Saint Dane arrives, hoping to lead the people towards self-destruction, especially through cultural homogenization, social inequality, discrimination, and totalitarianism. Bobby must then travel to each threatened territory to thwart Saint Dane's plans, sending journals back home (to Second Earth) to be received and kept safe by his best friends, Mark Dimond and Courtney Chetwynde, who become sometimes involved with the action and are deemed Bobby's "acolytes": personal helpers and record-keepers along Bobby's journey. There is one Traveler from each territory, and Bobby cooperates with all ten along his journey. Throughout the series, Saint Dane often confronts Bobby personally and asks him to join his side, but Bobby consistently refuses. Bobby soon realizes his central role in the battle for Halla: that he is to replace his uncle as the lead Traveler, pursuing Saint Dane and helping to guide the territories back toward stability with the assistance of the other Travelers, their acolytes, and further allies. The turning points of the ten territories, in order, occur on: the medieval