Angel Petronel still works at Heaven's Gate, but he is convinced that he deserves better service. His eternal tempter, the devil Urias, starts tempting Petronelus. Just pluck an apple from the Tree of Knowledge and he will know what only God knows! And the path to well-deserved recognition will be clear. But Petronel's argument with Uriáš over the Poznání apple ends ingloriously. In the skirmish, the rare fruit rolls down to Earth. The angel - confusion and his friend the devil-tempter must rush to the world to find and bring back the apple of Knowledge. On the eve of Saint Nicholas Day, they become entangled in a wondrous roar. They meet little Anežka and her beautiful mother Magdalena, a bunch of dishonest carolers, the ghost Košťál and the sympathetic Párkará. Before they manage to find the apple and return it to where it belongs, they will have to experience a great adventure and go through several dangerous situations. And after a series of human and "divine" tests, our heroes finally discover that the path to knowledge leads above all through oneself, through the discovery of the power of friendship, love and the ability to forgive.