Paras, short for "Perestroika," is a spirited racehorse at a racetrack west of Paris. One afternoon, she finds the door of her stall open and wanders all the way to the City of Light. Soon she meets an elegant dog, a German shorthaired pointer named Frida, and they keep company with two irrepressible ducks and an opinionated raven. But then Paras meets a human boy, Etienne, and discovers a new, otherworldly part of Paris: the ivy-walled house where the boy and his nearly 100-year-old great-grandmother live in seclusion. As the cold weather and Christmas near, the unlikeliest of friendships bloom. But how long can a runaway horse stay undiscovered in Paris? How long can a boy keep her hidden and all to himself?