Ralph Cummins

Bert Lyons returns to the Grainger spread from the "outside world" to find his former employer dead and the ranch in the possession of Calvert, a narcotics smuggler, and Blackie Lopez, a rustler who has his eyes on Molly Grainger, Lyons' sweetheart.

When the Government incorporates Bill Hayden's ranch into a Federal game preserve, Jack McCabe, a forest ranger, is sent to serve an eviction notice on Hayden and his daughter, Shasta. Hayden resists the order, and Jack falls in love with Shasta.

Partners "Smilin' Bob" Corey and Jim O'Neil are forest rangers sent to peacefully "penetrate" Paradise Valley, which is scheduled to become part of a national park. Although the townspeople are sullen about their presence, they manage to befriend Marie Roselli, an Italian girl whose brother Wolf owns a cattle ranch and from they obtain supplies. Before they; know it, Bob and Jim get caught up in a kidnapping, an illegal logging ring, and a murder.