Sunny Duane, a chorus girl, goes out to dinner with Cornelius Fellowes, a wealthy man who is murdered the same night. Anxious to avoid suspicion, she escapes and quickly marries a man who believes he is going to die and wants to leave her his fortune. He recovers but is helplessly crippled. With the law closing in a last minute change of fortune rescues Sunny future.
Robert Lanning, a proper Bostonian who owns an estate in southern New Mexico, suspects that some of his employees are smuggling arms into Mexico, and sends his son, Robert Jr., to investigate. During his journey west, Robert meets Mary Hamilton, a stranded actress from a roadshow company of Uncle Tom's Cabin. Because Mary is still in costume as the character, “Little Eva,” Robert mistakes her for a child and takes her with him to the ranch. He ultimately discovers the identity of the arms smugglers and, with the help of the Mexican Rurales, brings the gang to justice. Robert then realizes that Mary is not a child and wins her for his wife.
A scientist attempts to transplant a gorilla's brain into a man.
