The adventurous wanderings of a boy and girl to find the keyhole which fits the rainbow's golden key.

Publisher Annotation: As a piskey girl born without wings and raised underground, Ivy yearns for flight almost as much as she misses her long-lost mother. But the world outside the Delve is full of danger, and her dreams seem hopeless until she meets a mysterious faery who makes her an enticing offer: If Ivy helps him escape the Delve's dungeon, he'll teach her how to fly. Freeing Richard could cost Ivy her reputation, perhaps even her life. But when...