Arsene Lupin vs. Arsene Lupin

Andre Laroche, an industrialist, has just passed away. Face to his grave, as he is being buried, Anne de Vierne, the wife of a magistrate, confesses to her son Francois that Laroche was in fact Lupin and that he is his natural child. But he is not the gentleman thief's only offspring! Lupin had indeed another son by a housemaid, Gerard Dagmar, a dancer, magician and - occasionally - burglar. Which complicates the task of Francois who, to respect the last wishes of the testator, has gone in search of the treasure of Poldavia. For he keeps finding Gerard on his way and his efforts are constantly thwarted by his half-brother. Will Gerard prevent Francois from becoming the worthy successor to their father or will the two young men decide to join forces? That is the question.