The Invisible Woman (1940)

Eccentric Professor Gibbs (John Barrymore), brilliant but impractical, invents an invisibility machine and advertises for a guinea pig. What he gets is Kitty Carroll (Virginia Bruce), an attractive, adventurous model, who thinks being invisible would help her settle a few scores. Complications arise when three comic gangsters steal the machine to use on their boss. But they fail to reckon with the Revenge of the Invisible Woman!