The Prince of Yorsha Doon by Andrew Peterson

The Prince of Yorsha Doon tells the story of Safiki—already beloved by thousands of Wingfeather fans—as he emerges from his life of solitary freedom and becomes an accidental hero. Life on the streets of the bustling and mysterious city of Yorsha Doon can be hard, but Safiki loves being independent, free from the complications of personal relationships. But when he bumps into a very strange stranger who’s being far too conspicuous with the valuable book he’s carrying, Safiki finds himself at the center of a noble but foolhardy rescue and discovers that he can be braver than he imagined—and that friendship might be worth the risk after all.