Zosia lived in a yellow house with a big garden at the end of the street. What she liked most was playing with her cat Leo and collecting colourful leaves. One rainy afternoon, as it was getting darker outside, Zosia decided to go into the old attic of the house. The attic smelled of dust and old books. Among the boxes, suitcases and grandfather caps stood an old clock with strange markings on the dial. Leo jumped onto the box next to the clock and started meowing, as if to say, "Look here, Zosia!". Zosia came closer. The clock was tall and had golden hands. Next to the dial something shone - it was a red button. Zosia could not resist and pressed it lightly. Suddenly, the clock started ticking loudly and its hands turned faster and faster. Leo wagged his tail and hid behind the girl's back. Before Zosia had time to be frightened, the attic became full of coloured lights. In an instant, she felt like she was riding on the world's fastest carousel! The clock trembled, and then everything went quiet. Zosia opened her eyes. She and Leo were now standing in the middle of a big, green meadow where grazing .... huge, gentle dinosaurs! A small, funny-looking dinosaur with colourful feathers on its head ran past Zosia. Zosia looked at Leo. The kitten had big eyes and was very surprised. Had the clock moved them back in time? Suddenly they heard a voice: "Who's here?" Behind the big fern tree someone was hiding. Zosia felt her heart beat faster. Could it be someone else who was also travelling through time?