Arthur is just a lively ten-year older whose parents are away looking for work, whose eccentric grandfather was missing for many decades, and that lives with his grandmother in a country house that, in two days, will probably undoubtedly likely be repossessed, torn down, and turned into a block of apartments unless Arthur's grandfather returns to sign a few papers and repay the family debt. Arthur discovers that the key to victory lies within his descent to the realm of the Minimoys, animals no larger than a tooth, that his grandfather helped relocate with their garden. Somewhere one of them will be hidden a pile of rubies. Could Arthur save the day and be of stout heart? Romance beckons and also there lurks a villain.