Lenox Hart is a firefly fairy. While attending Fairy Circle, she discovers that an evil curse, brought on by a goblin, will soon kill all black squirrels, then spread to other animals, even mankind. Periwinkle, Thistle, and Marigold join Firefly, as she embarks on a hazardous journey through the Forgotten Forest to seek out the Black Stag and magical blue moon clover. The quest includes a visit to a dwarf and his squit, and the discovery of how blue moon clover is grown and found.