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Perez never planned to escape from the racetrack, but one day the caretaker forgot to lock the stable door. That's how the filly ended up in the heart of Paris. It seems like a nonsense: a horse wandering around the city! But this is only the beginning: Perez will meet Frida the dog, two adventurous ducks and a wise raven. However, it is when she meets Etienne, a boy who lives with his great-grandmother in a fantastic house, that Perez's life-changing experience begins. What will happen next? After all, they will be looking for the filly. Unless, of course, Etienne decides to hide her....