In faraway Nullaboo, Gemma Hart's day isn't going well. Her family might be evicted from their farm, and her science competition topic is march flies. How can she possibly win against perfect Nina, who gets to study butterflies?

But wait, that's not a feather in Gemma's special bug catcher . . . it's a fairy!

Janomi the fairy isn't supposed to talk to humans, but desperately needs help. Her grandfather has been captured by the silver spiders. Gemma agrees to help Janomi, and to keep the fairies' existence a secret. But her bug catcher has recorded their conversation - and Nina finds it.

With a media frenzy taking over Nullaboo, a secret government agency barges in to take control, and suddenly the fairy colony is under an even bigger threat. Gemma and her kooky family, school and resourceful neighbours must take matters into their own hands in an against-all-odds bid to save the last fairy colony on Earth.