In a magical world, invisible to human eyes, exists the enchanting Faery Realm. Prospective faeries called "littles" undergo rigorous training to uncover whether they possess the innate qualities required to earn their wings and become faeries at the esteemed Faery Academy of QuillSnap.This new academy has risen from the remnants of the former school, destroyed in a fierce power struggle, leaving many questions unanswered.

Tansy WaterSprite is a "little" no taller than a thimble, who finds herself ensnared in the Human Realm by her ill-tempered guardian, Merkel, following her mother's abrupt disappearance. Her dreary existence takes an unforeseen turn when a mysterious visitor sets her on a journey of escape and discovery. Tansy has a single opportunity to collect the rare Nipicat leaves, which are essential for creating an elixir required for the continued existence of the Faery Academy.

As the moon rises and the night grows darker, danger lurks as Tansy ventures into the enchanted forest, knowing that the Nipicat leaves can only be found during the Night of the Purple Moon as she runs out of time. Unbeknownst to her, Merkel stalks her every move, waiting for the perfect opportunity to implement her plan for revenge and power. The Night of the Purple Moon is the key as Tansy unearths the truth about her mother, the secrets of the original Faery Academy, and her true strength.