With Balandor and Slarkrethel dead together, Grimm and the Hornraven brothers with their condescending genius crab Bess press on to fight the Elder Brain and its Mind Flayer minions!  Things go badly but then the second Spawn of Slarkrethel turns the tables and victory appears to be within their grasp, but the Elder Brain escapes to the Astral Plane!  The group explores the surrounding rooms and finds a surgery room and a large library full of preserved brains, so they decide to try their hand at brain transplants!  Under Yngvar's knife, Grimm and Galron will never be the same!