Shortly after British businessman Sir Henry Sheffield (Broderick O'Farrell, as Roderick O'Farrell) approaches Gordon Rontell (Ted Adams), real estate agent and lawyer, in order to purchase property in Pine Canyon Valley, Sheffield disappears without a trace, and a series of murders and sabotage plague the local ranchers.

A stranger named Tucson Smith (Guinn 'Big Boy' Williams, as Big Boy Williams) and his pal, Stoney Martin (Al St. John), arrive in town and come to the defense of elderly Charlie Hayden (Lafe McKee), a rancher, when someone attempts to murder him. In gratitude, Hayden and his pretty daughter Joan Hayden (Molly O'Day) invite Tucson and Stoney to dinner at the home of Rontell, their trusted attorney, where Hayden explains that the owners of the ranches bordering his own have all been killed.

The next day, while riding into the Pine Canyon Valley, Tucson is shot at by a gang of outlaws, but due to his renowned skill as a sharpshooter, he manages to kill several of the men. Later he recognizes one of them as a member of a gang from across the border. When Tucson crosses the border and enters Juarez to investigate, he is ambushed in a saloon, but he escapes with Stoney and goes to the Hayden ranch, where he tells a sympathetic Jean about his childhood as an orphan.

Tucson later decides to meet Joe Sanchez (Martin Garralaga), an old friend who had gotten involved with outlaws, but who wants to reform, and just as Joe is about to reveal the name of the criminal behind the ranchers' murders, he is shot and killed by an unknown assailant. Tucson, however, has become suspicious of Rontell, and when he learns of Sheffield's visit to Rontell and of his subsequent disappearance, he warns the residents of Pine Canyon Valley to beware of the shifty lawyer.

When Hayden is shot and wounded, Tucson goes to Rontell's home, where he is ambushed, but manages to outdraw his adversaries and take Rontell prisoner. In Rontell's basement, Tucson finds Sheffield and learns that he was taken captive by Rontell after Rontell learned that there was oil on the ranchers' property. Rontell used Sheffield's funds in order to purchase the land cheaply from the bereaved relatives of the ranchers murdered by Rontell's own henchmen. The Pine Canyon sheriff arrives to take Rontell to jail, and as he explains to Hayden that Tucson is a self-styled vigilante who outwits and apprehends outlaws because his own father had been murdered, Tucson and Jean embrace.

A 1935 American Western film (a/k/a "Law of the Forty-Fives" and "Sunrise Guns") directed by John P. McCarthy, produced by Arthur Alexander and Max Alexander, screenplay by Robert Emmett Tansey, based on William Colt MacDonald's 1933 novel of the same name, cinematography by Robert E. Cline, starring Guinn 'Big Boy' Williams, Molly O'Day, Al St. John, Ted Adams, Lafe McKee, Fred Burns, Curley Baldwin, Martin Garralaga, Broderick O'Farrell, James Sheridan, and Glenn Strange.

Guinn Terrell “Big Boy” Williams Jr. (1899 – 1962) was an American actor. He appeared in dozens of westerns in the ‘20s and ‘30s. Big Boy was quite a star in his day, appearing in memorable westerns such as "Dodge City" (1939), "Santa Fe Trail" (1940), and "The Comancheros" (1961). His father, Guinn Williams Sr. (1871–1948), a Democratic congressman, represented the 13th Texas Congressional District in the United States House of Representatives from 1922 to 1932. When Big Boy returned from his war service as an Army officer in World War I, he saw no need to attend the appointment to West Point his father had secured for him, and became a baseball player instead. Nicknamed “Big Boy” by Will Rogers. Williams was 6’2” with a muscular frame. Big Boy made his screen debut in the comedy, "Almost A Husband" (1919), with Will Rogers and Cullen Landis. He was introduced by Will Rogers into polo, where he became a champion player. Throughout the 1920s, Big Boy would have a string of successful films, mostly Westerns, where he wore a ten gallon hat. Big Boy was frequently teamed with Alan Hale as sidekicks to Errol Flynn in several of his pictures.

This was the first film made of MacDonald's characters "The Three Mesquiteers", that later became a film series at Republic Pictures. Though only two of the characters, Tucson and Stoney, appeared in this film, Williams would appear as the missing member "Lullaby" Joslyn in RKO's "Powdersmoke Range".

Previously the Alexander brothers Arthur Alexander and Max Alexander had released a series of Westerns starring Guinn Williams under their Beacon Pictures company. This was produced by Max's Normandy Pictures featuring plenty of newly staged action, along with his usual usage of stock footage.

This a straightforward Saturday-morning talkie programmer is a basic grade-B Western, a bit flimsier in production values than most. Even a cool sounding title can't salvage this extremely low budget effort from Poverty Row studio Normandy Pictures. Only for the genre devotees.