Young Clara is looking for that one-of-a-kind magical key to unlock a box containing a priceless gift. She manages to find it using the golden thread her godfather presented to her but the key then disappears into a strange and mysterious parallel world. She is transported into the magical world, where she meets a soldier named Phillip, a gang of mice and the regents who preside over three Realms: Land of Snowflakes, Land of Flowers and Land of Sweets. But it is the ominous Fourth Realm, home to the tyrant Mother Ginger, that she has to go to with Phillip to retrieve her key. By doing so, she also hopes to restore harmony to the unstable land.