Color illus. by Joseph Schindelman. New York: Atheneum, 1963. Oblong 8vo. Blue cloth. Unpaginated. First Edition. Front corner lightly bumped; else FINE in price-clipped, lightly worn & soiled d/j. 
Maruice is a French mouse who lives in the Louvre museum. One night he overhears two men plotting to steal the Mona Lisa!