Mary Grant has a gambling father and a mother who has disappeared. Even though she has been raised in a convent she proves true to her ancestry by running away to Monte Carlo and spending her small inheritance at the gambling table.

Through a forged will, a crook assumes control of a valuable estate. He poses as the brother of a dead man, and endeavors to dispose of the deceased man's two daughters, one of whom is in love with the forger's son.

Happy-go-lucky cowboy Bob Fleming exhibits such prowess with his pistol, that he wins the three gold coins offered by millionaire Luther Reed to test his marksmanship. Bob also makes an impression on Reed's pretty daughter Betty. The cowboy is so admired by the local citizenry that when crooks J. M. Ballinger and Rufus Berry arrive in town, they decide to make Bob their patsy. After planting oil on Bob's land, they sell stock to the townfolk and the cowboy, who has been innocently drawn into the scheme, turns it over to the crooks for safekeeping. For his efforts, Bob is arrested and found guilty of defrauding the stock holders, and also charged with being notorious outlaw Pat Duncan. After several adventures, Bob succeeds in capturing the real Duncan, vindicates himself of the charges and wins Betty for his bride.

Lord Anthony Crackenthorpe engages the help of a zoologist's widow to help him write a book about his favorite subject, spiders. She moves into his mansion with her impetuous daughter Peggy. Anthony's mother is very worried that her son, heir to the Crackenthorpe estate may become involved with Peggy. She asks her younger son Jimmy to keep company with the young girl.