The Nighthawk, Paperback

Follow Charlie and Abby when they take a canoe trip to Nicatou to visit Awasosqua, Abby's grandmother. People are dying in her village, but there's a cure and Charlie and Abby are the only ones who can bring it home. The only problem is that it can only be found a long time ago, in the shadow of the Nighthawk's homeland where Charlie has to face the black wings.