The prisoner of Zenda

'We must leave for Zenda at once, to find the King!' cried Sapt. 'If we're caught, we'll all be killed!' So Rudolf Rassendyll and Sapt gallop through the night to find the King of Ruritania. But the King is now a prisoner in the Castle of Zenda. Who will rescue him from his enemies, the dangerous Duke Michael and Rupert of Hentzau?