One morning a little boy named Kacper woke up and felt that something was missing. He rubbed his eyes, looked at his teddy bear Lulku and sighed sadly. - Lulek, today I don't feel like playing... - he said quietly. Lulek tilted his head with worry. - Perhaps you have lost your joy? - asked the teddy bear. Kacper looked out of the window. Outside the window was a big, green forest and rays of sunlight were dancing on the leaves. - Let's go look for her! - suggested Kacper and a moment later he and Lulk were standing on the doorstep of the house, ready for the expedition. The forest hummed quietly and the birds sang their morning songs. Kacper felt a slight tickle in his stomach - it was fear, but also a little curiosity. - Don't worry, I'm with you," whispered Lulek. Soon, behind a large oak tree, they came across a mysterious hedgehog in a blue cap, who looked very thoughtful. The hedgehog looked at Kacper and said: - I may have seen your joy! But before I tell you, you must solve a riddle.... Casper's heart began to beat faster. Would he be able to find his lost joy? What riddle has the hedgehog prepared for them?