Returning from their first grand adventure, M and Zoey try to readjust to normal things like family and school. However, they soon learn that Aunt Nellie has been summoned before the Aunt's Council to explain her actions with M. Determined to testify in her defense, M, Zoey, and Monty set off in the Ladybug, taking along M's little brother Erik. But before they can arrive, they are forced to land by the Crimson Guard and taken to the mysterious Infinite Keep where a great challenge awaits.
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