Erma Desmond gets a job as a companion to high society's Bertie Stanley, to whom she bears a striking resemblance. While her husband Hugo has been in Europe, Bertie has fallen in love with another man, so she makes plans to go to Reno for a divorce. She urges Erma to stay in the Stanley mansion and assume her identity while she is gone, so that no one will be aware of her absence. An obedient Erma agrees and the masquerade works perfectly until Hugo returns unexpectedly from Europe and Erma must fool the man who knows Bertie best. After some initial problems, Hugo gets along better with Erma than he ever did with Bertie, and as a result, when word comes that Bertie has a fresh divorce and a new husband, Hugo first determines the identity of the woman living with him, and then marries her.