The seventh of Universal's sound-era serials (slid between two Tim McCoy serials, "The Indians Are Coming" and "Heroes of the Flames") has secret service agent Gary Gordon (
Kenneth Harlan) assigned to run down a band of smugglers known as the River Gang. Unknown to him, John Mackey (
William Worthington), father of his sweetheart Lola (
Edna Murphy), is a member of the gang. When Mackey's partner Joe Burke (
William Thorne) is killed, Kent Martin (
Gayne Whitman) claims he has evidence that will convict Mackey of the crime, and tries to blackmail Mackey to gain his consent to a marriage with Lola. The latter is not thrilled at this prospect and even less thrilled is Martin's sweetheart Jane Madden (
Gertrude Astor). When the blackmail ploy fails, the ever-romantic Martin kidnaps Lola and takes her to his cave hide-out.
—Les Adams <longhorn1939@suddenlink.net>