Hired to guard the Pacific Express during a trip to San Francisco, crime-solving cowboy sleuths Gustav "Old Red" Amlingmeyer and his brother, "Big Red, " deal with a scheming gang of outlaws and a killer hiding among the train's passengers.
In 1893, inspired by their hero, master sleuth Sherlock Holmes, two cowboys, Big Red and Old Red Amlingmeyer, put their detecting skills to use to uncover the truth about the murder of a ranch hand on their Montana cattle ranch.