Ever wondered what happened to the teeth that you left under your pillow? When Ellie's older brother is turning thirteen, she wants to see the 'transformation' into a teenager for herself. Ellie hides in a cupboard and waits. She is shocked to witness her brother kidnapped by goblins and replaced with a clone. A passing Tooth-Fairy is drawn by the use of magic and gets caught up in the commotion, to discover that Ellie is descended from the legendary Merlin. Together they embark upon an adventure for Ellie to rescue her brother, whose destiny begins to take shape as he must attempt to incite a rebellion against the goblins that try to enslave him. The siblings' combine their efforts with the fairies in their fateful struggle against the Tooth-Goblins.