Irma, the title character of the French musical Irma La Douce, is a young woman working the streets of Paris. Nestor le Fripé, a poor law student, falls for Irma and grows jealous of her clients. To remain Irma's only lover, Nestor assumes the disguise of a rich older man named Oscar, taking numerous jobs to support himself and Irma. Unable to sustain his exhausting life, Nestor ultimately “kills” Oscar. But the authorities, believing the murder actually took place, convict Nestor and send him to the Devil's Island penal colony. Nestor ultimately escapes and returns to Paris to prove his innocence and reunite with Irma.