When Melissa gets bored she becomes very naughty. Even though her mother warns her to behave herself, Melissa can't help but be naughty. So, what can she do on a rainy boring day? Wishing to have adventures, she goes for a walk and creates adventures for herself. What can be a better adventure than accidentally turning herself into a cat? Having a small hamster as a friend, Melissa has to be clever and try to understand what is happening. Will she be able to solve the mystery and turn everything the right way? Or will she stay a cat for the rest of her life?