Maxim disappears all day long while visiting an elderly neighbor who looks like a medieval alchemist. He initiates the boy into the secrets of his science and prepares some amazing experience in which Maxim will play the main role. True, on the door of the apartment in which the warlock’s laboratory is located, some faces appear every now and then, and an unknown voice utters mysterious words, but... Maxim shouldn’t sacrifice a unique opportunity because of this ridiculous obsession! The boy is impatiently waiting for the appointed hour, when, spellbound, he takes a glass with a mysterious potion from the hands of the old man, and suddenly...