Homeless Mina Rogers is desperate for a job, is briefly employed as a housemaid for three nurses. When she loses the job, she decides to impersonate one of the nurses to take a job at the home of wealthy invalid Harvey Gorman. There, she comes under the control of Gorman's male nurse Roberts, who, discovering her deception, forces her to aid in his plan to acquire the money that Gorman plans to leave to his ranch foreman Cal Morgan. While Roberts begins poisoning Gorman with arsenic, Mina is instructed to seduce Cal into proposing to her, a plan that fails only because the jealous daughters of the ranch's housekeeper expose Mina's charade. When it is learned that Gorman is being poisoned, Mina is suspected, but a letter is eventually discovered that incriminates Roberts. Dr. Prine, Gorman's doctor, has fallen in love with Mina and, after hearing the story of her miserable childhood, forgives her impersonation.