After breaking up a fistfight between two men, Sheriff Morgan does some investigating and learns that one of the men, a prominent businessman, is wanted in Phoenix for passing bad checks. The catch - the crime has a three month statute of limitations which is about to expire.
A desperately ill Mexican woman slips across the border and arrives with her young son at the Blair's ranch house seeking help. When the mother dies, the Blairs seek the assistance of a priest to adopt the boy. Unless Sheriff Morgan can find evidence the youngster is an American citizen, he'll be shipped back to Mexico; in the interim, he has to track down the killer who's trying to cross the border in the other direction.
Sheriff Morgan's friend is distraught that his pretty daughter has eloped with a no-count, gold-digging rodeo star. Morgan discovers the cowboy is a polygamist and crosses county lines to hunt him down.
Burton is found dead at the bottom of some steps outside his office. What appears to be a fatal accident becomes a murder investigation when Sheriff Morgan learns that the businessman recently obtained a huge diamond ring, which is now missing and was, unknown to him, part of a jewelry heist. The lawman trace the ring to a waitress who says she returned the ring to the mentally challenged handyman who gave it to her. The handyman says she kept the bauble.
Two thugs hold up a diner, leaving the counterman and cook beaten and unconscious. They're spotted by a trucker who phones in a description of the men and their vehicle to the Cochise County police. Sheriff Morgan and his men set off in hot pursuit to capture the robbers before they can escape into Mexico.
Two truck drivers find a rancher by the side of the road who apparently died of a heart attack. Sheriff Morgan learns that the car had the gas siphoned out of its tank and the wad of cash the rancher was carrying has disappeared. Backtracking his movements to the previous evening, the lawman learns that the rancher's financial status was overheard by three drifters working on a nearby spread.
An elderly man who has been feuding with his son-in-law calls the sheriff claiming to have been poisoned. Later, after having transferred his ranch property to his daughter, the old man disappears from his home, leaving only a bloody knife and the track of a dragged body behind. Sheriff Morgan arrests the son-in-law on suspicion of murder, but is concerned that the case may fall apart since the body of the old man is never located.
After his mother and stepfather separate, their teenage son shows he prefers his stepfather's ranch to the bright lights of Bisbee by running away from home at every opportunity. When the boy's mother charges her estranged spouse with kidnapping, events take a violent turn, forcing Sheriff Morgan to require a hearing in juvenile court.