Inspired by a 19th-century London postmaster's correspondence, this commonplace story of Clarence, a country cat who goes to the city and finds employment as a post office mouse catcher, is so peremptory in its plotting that it seems designed chiefly as travelogue commentary for Haley's stiff, cliched views of Victorian London and its cats. But the street scenes compare unfavorably with those on low-budget wallpaper or gift wrap, and Clarence belongs with the corniest of nursery decals.