Hunter x Hunter (3-in-1 Edition), Vol. 4: Includes vols. 10, 11 & 12:

Plucky Gon's quest to find his dad leads him into a whole world of crazy adventure. Hunters dedicate their lives to tracking down treasures, magical beasts, and even other people. But such pursuits require a license, and less than one in a hundred thousand can pass the grueling qualification exam. Those who do pass earn the right to call themselves Hunters. Gon's search for his father continues! After he's forced to pawn a precious possession to raise some cash, he stumbles across a silent auction bazaar and dives into the seedy world of rare-item appraisal. But trouble brews when two Spiders are spotted lurking in Yorknew City. Gon and Killua track them using Zetsu, but they stumble right into the Spiders' web-and get captured!