Tosia and Mikhail loved visiting their grandmother Helena. Her house always smelled of fresh cakes and was full of mysterious objects. One rainy afternoon, the children were playing in the attic. In a corner, under a thick layer of dust, stood a large clock with a pendulum. "Look, Michael! I've never seen it here before!" - exclaimed Tosia. Mikhail came closer and noticed that there were strange characters engraved on the clock and a smiling sun. Tosia touched the golden button and suddenly.... the clock started ticking loudly and the hands spun faster and faster! Coloured lights flashed all around and the children felt light, as if they were flying. Suddenly, the attic disappeared. Tosia and Mikhail stood in a green meadow where dinosaurs were grazing! In front of them stood a huge, curious triceratops and looked straight at them.... What will happen now?