The fairy tale tells the story of a royal couple who cannot have children. With the help of a magical prop, they finally succeed, but in double measure. They give birth to twins. Which prop is responsible for this? Well, take a guess, or better yet, take another look at the title of the fairy tale. When the boys grow up and one of them is supposed to take over the joys and responsibilities of ruling, an unsolvable problem arises: should it be Vojta or František? We won't reveal the plot with all its twists and turns, but one thing is certain: the boys set out into the world with the understanding that the one who can perform the greater heroic deed will become king. The princes, even though they are not exactly cut out for it, take on the task with all their vigor and responsibility.