Book Two left off with Gregor reading the Prophecy of Blood: a prophecy that calls for Gregor and Boots to return to the Underland to help ward off a plague. But this time, Gregor's mother refuses to let Gregor return to the Underland ...until the rat Ripred assures the family that Gregor and Boots are needed only for a short meeting, which the crawlers will attend only if their "princess" Boots is present. Gregor's mom finally relents, but on the condition that she go with them so they aren't out of her sight. When they arrive in the subterranean city, the plague is spreading--and it has claimed one of his closest companions. Only then does Gregor start to understand how the illness plays with the fate of all warmblooded creatures, but this still doesn't give him the answers on how too stop it. As the search continues, time starts running out.