Sleuths of Sorcery by Anne Hutchins and Bart A. Marchand - Free

When a creature from another plane wreaks havoc, the headmaster of a wizards' school and his former pupil seek out its creator and find more than they bargained for. Terjal Rakmir, Headmaster of Cloudreach, is content to spend his days schooling pupils in the Conjurer’s art. However, when a direspawn (a creature brought over from another plane) wreaks havoc and destruction upon the lands, Terjal is immediately pressed into service by Cloudreach’s patron, Lord Vaukmond, Duke of Windemere. Lord Vaukmond, the Warrior Duke, distrusts magic yet has no conventional means of destroying the direspawn. With his former pupil, Aiya Lindsmund (now Adjutant to Lord Vaukmond), and his three Blades, Terjal sets out on a quest which will, in the end, cause him to uncover more than just the identity of the direspawn’s creator. Before the quest is ended, Terjal and Aiya will face forces greater than they could ever have imagined: forces fueled by a bitter, exiled sorcerer and his vengeful protégé.