When young Rosana visits the zoo and hears a strange voice speak to her, she is shocked to discover that the voice belongs to a hippopotamus! The hippo, who insists on being called Mister H, politely asks her to release him from his habitat. Once free, Mister H begins to explore the world around him. But how will people react when they see a hippo roaming the streets? And will Mister H be able to find his true home?

This funny, one-of-a-kind illustrated novel will keep even the most reluctant readers entertained.