The Sea Towns sprawl along the coastal region until their streets and alleys intermingle and none could say where one leaves off and the other begins. Welcome to the Heart of Glass, a dark, twisted forest of tunneled streets, alleys, homes, arches, shops, and markets. This Castles & Crusades adventure - designed for 3-6 characters of levels 4-6 - pits the party against thieves, assassins, and other denizens rooted in the Heart of Glass.