The Duke of Mantua plans to marry off his daughter Eugenia to the ruler of Florence; to do so, he shuts Eugenia in a tower and banishes her noble suitor Philenzo. But Philenzo returns in disguise, and brags to the court that he can succeed in any task the Duke assigns him — if the Duke grants him the financial resources necessary. The Duke (in the best fairy-tale tradition), sets Philenzo the task of gaining access to the princess Eugenia in her sequestered tower; the Duke considers the matter as something of a joke, but also a good opportunity to test the soundness of his security. Philenzo is allowed a month for the task, and a blank check on the Duke's treasure house. And of course, the penalty for failure is death.