Flat Stanley is on a top-secret, super-important mission to Paris, France, where he must pose as a painting in the Louvre. Hopefully working undercover as a painting, he can find out who is stealing expensive works of art! But Stanley soon becomes very bored until he meets Etoile, a talented art student who shows him around the City of Light. But when Stanley returns to the museum, he discovers that the Mona Lisa has been switched out for a fake! Can Stanley find the real painting and figure out who the thief is? Recommended for ages 7 to 10 years.