One sunny morning, Ada and her older brother Johnny went for a walk in the nearby forest. The wind was gently swaying the leaves of the trees and the sun was breaking through the dense crowns, creating a colourful carpet of rays of light on the ground. Next to an old oak tree, which seemed to be the guardian of the forest's secrets, Ada noticed a small, barely visible path. "Janek, look!" - she called out, pointing to a path that had never appeared to them before. Janek, always adventurous, was immediately interested. "Come on, let's see where it leads!" - he said enthusiastically. The path was narrow and winding between the trees, and with every step they took, the rustling of the leaves echoed around them like soft music. After a few minutes, they reached a small opening in the ground, hidden under the roots of an old oak tree. "This looks like the entrance to another world," - whispered Ada, coming closer. Janek, holding his younger sister's hand, full of curiosity, also moved closer. In the opening at the back, a light was visible that was unlike any the children had known. It was warm, orange and pulsating, as if something or someone down there was inviting them in. "Maybe it's the land of the Mink that Grandpa told us about?" - wondered Ada aloud. Janek, though a little uncertain but intrigued, nodded. "Maybe. But only one way to find out!" The decision was made. Brother and sister, holding hands, began to walk slowly down into the mysterious light. Their hearts beat faster as they got closer and closer to the...