Magali is a musician and Guillaume is the driver of a scenic train. Their love for each other being as strong as it was at the beginning, they live together a quiet suburban life filled with reasonable dreams and a long awaited pregnancy. But things get messy when Guillaume’s father, whom he didn’t know, gets in touch with him to tell him that, according to an agreement dating from Middle Age, he is the heir of a genuine kingdom located off France and England. At first, Guillaume and his wife can’t believe it. But then, the idea of ruling over a paradise island and its faithful subjects, of a castle and a fortune is quite attractive! But reality is far from what the couple imagines. The island is nothing but a shabby windswept rock, and its inhabitants are only five of them and rather offbeat… As Magali raves about her royal future, their new servants strive to elaborate maniac schemes to hide the truth from them …. Until it is too late for Guillaume to abandon his crown.