Nadia lived in a yellow house with a big garden. What she liked best was to lie on her soft blanket with colourful stars. One morning, when a ray of sunshine came into her room, she noticed something unusual - when she covered herself with the blanket, her arms... disappeared! Nadia was delighted. She quickly called out to her cat, Fluffy. - Fluffy, look! I can be invisible! - she whispered excitedly. The cat only purred and also went under the blanket. Now he too had disappeared! Nadia and Fluffy began to think of what mischief they could do while invisible. Maybe they could sneak into the kitchen for a cookie? Or maybe they could solve the mystery of the mysterious shadow that sometimes appears under the living room table? Suddenly they heard a quiet rustling. - Did you hear that, Fluffy? - asked Nadia. The rustling grew louder and louder and came straight from under the table....