Hunter x Hunter, Vol. 31: Volume 31  (English, Paperback, Togashi Yoshihiro)

Plucky Gon's quest to find his dad leads him into a whole world of crazy adventure. Hunters are a special breed, dedicated 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 gain access to restricted areas, amazing stores of information, and the right to call themselves Hunters. The time has come for the Hunter Association to choose a new chairman, but it's shaping up to be anything but a clean election. While the world's Hunters descend into dirty politics, Gon remains hospitalized in critical condition. Killua knows of a way to save him, but it will mean facing his deadly family of assassins...and the deadliest and strangest of them all, Killua's little sibling Alluka...