Andrew Apperley convinces his brother David to join him on his Western ranch. Accompanying Andrew is a wild wolf dog named Comanche. As the brothers are sailing on the East River, a prisoner escapes from Blackwell's Island and is rescued by Comanche. When police come aboard the ship, the convict, Single Jack Deems, escapes again. When they arrive at the ranch, Andrew tells David that everything he owns is imperiled by Alex Shodress, a dangerous outlaw. Deems later shows up at the ranch to buy Comanche and Andrew tells him that there is one way he can take possession of the dog, if he is willing to do it.