Uncle Hoole’s idea of a vacation is visiting the palace of Jabba the Hutt. Of course, it’s a working vacation. Hoole wants to study the B’omarr monks who live in tunnels beneath the palace. If Jabba isn’t enough to give Zak and Tash nightmares, the monks should do it. The most enlightened monks don’t have bodies. They’re just brains in jars. Brains in jars that walk around on robotic legs. Worst of all, one of the monks is mad—not just angry-mad, but out-of-his-mind mad. And if Tash isn’t careful, she might lose her head.