After receiving a gift left to her by her late mother, Clara is led into a parallel world and finds herself obliged to take sides in a war waged between the four realms within this toy world.

It's there that Clara encounters a soldier named Phillip (Jayden Fowora-Knight), a gang of mice, and the regents who preside over three Realms: Land of Snowflakes, Land of Flowers, and Land of Sweets.

In Victorian London, young Clara receives an egg-shaped box from her late mother, which she is unable to unlock, together with a note saying that inside the gift is all she will ever need.