Sunwing (Silverwing Series #2)

Shade, a young Silverwing bat in search of his father, discovers a mysterious Human building containing a vast forest. Home to thousands of bats, the indoor forest is as warm as a summer night and teeming with insects to eat. And through the glass roof, the bats can finally see the sun, free from the tyranny of the deadly owls.
Is this Paradise the fulfillment of Nocturna's Promise to return the bats to the light of day? Shade and his Brightwing friend Marina aren't so sure. Shade has seen …