Alex is an 18 year old young man. He has been a big fan of the Arthur and the Minimoys fantasy film saga for years. Then his group of friends suggests that he goes to the abandoned house where the film was shot. They are unaware that they are about to fall into a deadly plot.

Arthur is a spirited ten-year old whose parents are away looking for work, whose eccentric grandfather has been missing for several years, and who lives with his grandmother in a country house that, in two days, will be repossessed, torn down, and turned into a block of flats unless Arthur’s grandfather returns to sign some papers and pay off the family debt. Arthur discovers that the key to success lies in his own descent into the land of the Minimoys, creatures no larger than a tooth, whom his grandfather helped relocate to their garden. Somewhere among them is hidden a pile of rubies, too. Can Arthur be of stout heart and save the day? Romance beckons as well, and a villain lurks.