The third in the <i>Topper</i> comedy- mystery series, Cosmo (Roland Young) is besieged by a wisecracking ghost (Joan Blondell) who demands that he help her find her killer. The story is set in Carrington Hall, a magnificent old haunted house, complete with a cloaked villain who comes and goes through walls. Falling chandeliers, secret passages, and a trap door with a chute that leads to an underground tunnel adds to the mystery. The cast of characters includes a malevolent butler, a straightlaced housekeeper, a frightfully playful seal, the disappearing body of Joan Blondell, and Topper's chauffeur "Rochester" who is afraid of the invisible ghost's antics. Excellent special effects and outstanding performances by an all-star cast provides delightful entertainment.