Morin, Bart, Reginold, and Skodris pursue Polonus’ kidnappers deep beneath the earth into the underdark, where they meet up with Targus and company. After dispatching the trolls as tasked upon them by Carmeneren, they catch up with Haragswald and his band. They rescue Polonus, defeating the slavers and taking one prisoner. The party returns Polonus to the safety of his temple and questions their captive, Prentys. She reluctantly tells them that her group has been kidnapping spellcasters and selling them to illithids in the kuo-toan City of the Glass Pool that lies deep beneath Harrenshire. Why the illithids want these captives, she does not know, but they pay handsomely in pearls. Targus releases her on the condition she never returns to the valley. Morin agrees to stay on and help the party.
Targus must attend to some of his duties as Steward while back home at the castle. Bart, Reginold, and Skodris are promoted and they increase patrols. Guards are posted at the temple of Agan and the nearby sacred grove of Lowen, but the soldiers of Harrenshire are under-manned for the task of protecting the populace from further kidnappings. Targus dispatches letters to King Maryth II and his old garrison commander in Aras requesting more troops or reliable mercenaries to augment his men-at-arms. He also attends to the treasury with Frandris, finding that funds are running low after settling Ando’s accumulated debts and paying out wages and construction costs.
After a rest at the castle, the party returns to visit Carmeneren and the svirfneblin. She gives them more details about areas of the underdark, and the dangerous path to the City of the Glass Pool. Targus broaches the subject of opening trade between Harrenshire and the deep gnomes. Carmeneren seems amenable to the possibility once the immediate threats to the two communities have been resolved. The party first tries their luck against the “great reptiles” marked on the gnome map, but they are forced to retreat after a battle with a powerful behir. They opt instead to clear the more direct route towards the City of the Glass Pool, battling a colony of grell, as well as hook horrors and troglodytes along the way.