The PCs begin in the port city of Luskan, where they're hired on by a caravaning merchant to perform guard duty for the long, dangerous journey over the Spine of the World Mountains. If the heroes do well, they reach the small town of Targos, where they hear rumors of a dead mage's lost tower out on the tundra. In order to find it, the PCs must overcome numerous obstacles but may find allies in the peoples of the Ten-Towns region, including a barbarian prince, a sly halfling, and a unique ranger. Not all is as it seems, though, nor can all smiling faces be trusted. Can the PCs separate the truth from the lies, locate the Accursed Tower, determine all its secrets, and survive?