Flora Hawks is in love with the overseer of Tarzan's African estate. After a search for a legendary city of diamonds, Tarzon races with his pet lion Jad-bal-ja to save Haws from being sacrificed to a lion-god.
Barbanas Barty inherits some money, sets off to London, meets and falls in love with Lady Cleone Meredith, and this does not set well with Sir Mortiner Carnaby, who has eyes on the fair lady himself. Barnaby becomes friend with Viscount Devehon, buys a horse from him and enters it in the big steeplechase. Sir Mortimer takes steps to rid society of the presence of this non-gentleman.
A young woman, Molly Marble, is enmeshed in a train robbery by her crooked step-father. She meets a stranger, Jeff Morton, and suspects he knows where the loot is hidden. For the sake of her relatives, she must try to 'vamp' this information from him but, instead, she falls in love with him.
Robert Mason, a young black newspaperman, exposes corrupt labor leader Mark Lethier. In turn, Mason's engagement to Vivian Lethier is ended. When Mark Lethier is murdered, Mason is convicted on circumstantial evidence and sentenced to prison. After several years in prison, he escapes and makes his way to the southwestern cattle country, where he falls in love with Tex Miller, a beautiful cowgirl. Mason endeavors to rid the territory of an outlaw band led by Buck Conley, a.k.a. the "Night Terror." Once he is successful, he decides to give himself up to the law, thinking that he will be sent back to prison. However, after discovering that the real murderer has confessed, he returns to Tex and the country he has come to love.