When extravagant playboy Richard Russell exhausts his inheritance, he is forced to discontinue his patronage of eccentric scientist Professor Gibbs. As he is on the verge of perfecting his experiments with invisibility, the professor decides to continue his work and advertises for a subject to test his invention. Answering the call of adventure, model Kitty Carroll consents to become his first subject. The experiment is a success, and the professor rushes to tell Dick that he will be able to recoup his money through sales of the machine. While still invisible, Kitty decides to exact revenge on her abusive boss and disappears. Unable to find the elusive Kitty, Dick decides that the professor has gone mad and retreats to his fishing lodge. Meanwhile, a gang of crooks decides to steal the machine to render their leader, Blackie, invisible so that he can return from his hideout in Mexico. Kitty, her revenge accomplished, returns to the professor, and he drives her to Dick's lodge, where she gets drunk and falls in love with Dick. While Dick is romancing the invisible Kitty, the crooks steal the professor's machine and truck it to Mexico. The next day, a visible Kitty and the professor return to his lab to find the machine missing. In Mexico, the crooks discover that they need the secret formula for the machine to work, and consequently, they return to kidnap Kitty and the professor. Dick, who has fallen in love with Kitty, follows them to Mexico. At Blackie's hideout, Kitty, who has discovered that alcohol will render her invisible, drinks some spirits and captures the entire gang. When Dick arrives, she allows him to rescue her, and all ends happily as they marry and have a semi-invisible baby.