City of Speed (Battle Dragons #2)

In a modern mega-city built around dragons, one boy gets caught up in the world of underground dragon battles and a high-stakes gang war that could tear his family apart. In the city of Drakopolis, dragons and humans have co-existed for centuries. Dragons burn the city's garbage, taxi its busy citizens from place to place, and even compete in vicious underground battles for ganglike kins. But the dragons also compete in legal sports, like the spectacular aerial races that draw in cheering crowds