Perez never planned to escape from the racetrack, but one day the caretaker forgot to close the stable door. So the filly ended up in the very heart of Paris. It seems like nonsense: a horse is wandering around the city! But this is only the beginning: Perez is waiting to meet the dog Frida, two adventurous ducks and a wise raven. However, the meeting with Etienne, a boy who lives with his great-grandmother in a fantastic house, becomes truly fateful for Perez. What will happen next? After all, the filly will be sought. Unless, of course, Etienne decides to hide her...