Sunwing (Silverwing Trilogy, Bk. 2)

In search of his father, Shade discovers a mysterious human building which houses a huge forest. Home to thousands of bats, the indoor forest is as warm as a summer night, teeming with insect food, and free from the deadly owls. Paradise? Then why are bats disappearing without trace? Soon, Shade and his friend, Marina, are swept up in a perilous adventure that takes them far south to the jungle home of Goth, the diabolical king of the cannibal bats. Shade must use all his cunning to rescue his long-lost father - and prevent Goth from creating eternal night ...