During a summer stay on the mainland, Tinker Bell is accidentally discovered while investigating a little girl's fairy house. As the other fairies, led by the brash Vidia, launch a daring rescue in the middle of a fierce storm, Tink develops a special bond with the lonely, little girl.
A blue harvest moon will rise, allowing the fairies to use a precious moonstone to restore the Pixie Dust Tree, the source of all their magic. But when Tinker Bell accidentally puts all of Pixie Hollow in jeopardy, she must venture out across the sea on a secret quest to set things right.
When a misunderstood dust-keeper fairy named Zarina steals Pixie Hollow's all-important Blue Pixie Dust and flies away to join forces with the pirates of Skull Rock, Tinker Bell and her fairy friends must embark on the adventure of a lifetime to return it to its rightful place.