The Invisible Woman (1940)

The eccentric Professor Gibbs puts an ad in the newspaper: "WANTED: A human being willing to become invisible. No remuneration. Box P19." But Gibbs is no crackpot. He really did invent an invisibility machine, and he really does need his first human guinea pig. He's rather surprised when the K. Carroll who answers his ad turns out to be a woman: Kitty Carroll, a dress model with an oppressive boss. And that boss is the real reason she wants to be invisible. The beleaguered model wants to revenge herself on him and thus win one for the working girl. Meanwhile, the loony scientist's patron, the wealthy playboy Richard Russell, learns he has just squandered every penny of the family fortune on girls who sue. His long suffering manservant keeps threatening to resign. But if that invisibility machine works, Richard will have it made - again. Unfortunately, the machine has attracted the interest of some thugs whose boss is stuck in Mexico unable to cross the border. Invisibility is just what he needs to get past the checkpoint.