No sooner does 13-year-old Rory become aware of “Manahatta,” the world of ghosts, monsters and spirits that twines through the familiar streets of New York City, than he is swept up in a tide of deadly intrigue in this uncommonly entertaining crossover debut. Though someone has found a way to kill the supposedly immortal gods of the title—all figures from New York’s past—that subplot takes a back seat to the machinations of Hex, a magician who enlists Rory in the seemingly worthy effort to break the magical barrier that has imprisoned the spirits of the island’s native Munsees in Central Park. Largely clueless but brave and subject to occasional fits of canniness, Rory gets help along the way from a rousing supporting cast led by his kick-ass little sister Bridget, who has an alternate persona she dubs “Malibu Death Barbie,” and a diminutive but intrepid Battle Roach named Fritz. Along with plenty of action, Mebus stuffs his pages with references to New York’s history, draws most of the threads together in a suspenseful climax and provides a satisfying sense of resolution at the end while leaving plenty of issues for future episodes. (cast list, map) (Fantasy. 11-13)