Slovakia, on the eve of the outbreak of World War II. The family of the young Jewish Martin Friedmann gathers to celebrate his bar mitzvah and make a solemn promise that they will all meet again a year later around the same table; but the storms of war and anti-Semitic fanaticism will lead each of them down very different paths.

The Queen of the Waterland gives the King Juraj access to the water of life when his daughter is seriously ill. However, if the magic fluid falls into the wrong hands, it loses its power.

In the royal castle, Prince Matthias feels like a prisoner. His father forces him to get engaged to Princess Beatrix, whom he does not love. Matthias takes advantage of a chance encounter with the rogue Tomas, who is his identical double. The boys swap clothes and agree to try on each other's lives for a day. In the morning, Matej is wrongly accused of theft and imprisoned. Tomas has to stay in the castle and although he tries to convince the king that he is not the true prince, no one believes him. The two boys must face a world they have never known before, grow up and learn to take responsibility for their decisions. Their reward will be that they both find true love.