The Case of the Bitter Draught is the fourth book in the Wolflock Cases teen fantasy mystery series. The festival of Mabon always left a sour taste in Wolflock's mouth. He'd do anything to get out of it. So, when Captain Blutro asks him to investigate a smuggler and contraband conspiracy, Wolflock doesn't care what it takes to solve the case. But Wolflock soon finds he must exercise his best powers of perception to find the answers without tipping the culprit off. If he treads too hard, the case will be lost, and he'll have to participate in the dreaded holiday. But amongst his new friends, who is the criminal?