"Ghost Town Law" was part of Monogram's Rough Rider series starring Buck Jones, Tim McCoy and Raymond Hatton playing undercover marshals. It is, in my opinion, one of the best of the series.
Two federal Marshals are murdered in a ghost town by an outlaw gang. Marshal Tim McCall (McCoy) is called in. He vows to avenge their deaths and calls in his partners, Buck Roberts (Jones) and Sandy "Killer" Hopkins (Hatton). The gang, headed by Ace (Tom London) and Gus (Charles King) are hiding out in an old gold mine which runs under the old town.
Heroine Josie Hall (Virginia Carpenter) arrives to find out what has happened to her brother and her aunt. She insists on going to her aunt's creepy old house with McCall where they meet Judge Crail (Murdock MacQuarrie) and Tom Cook (Howard Masters), the foreman of her aunt's ranch. Roberts arrives on the scene posing as a miner lost in the desert and feigning amnesia. He also has saddle bags full of gold. Sandy, meanwhile, has befriended an old prospector, Luke Martin (Milburn Morante).
Josie gets Luke to take her down into the mine where they are captured by Ace and the boys. As the Rough Riders close in on the bandits, they learn that they have a leader who is the brains behind them and.....................................................
This film has a little more action than most in the series. In addition to the creepy setting, there is a dandy fight between Jones and Charlie King (rare for this series). It's also unusual in that there are several cold blooded murders and references to same. As Ace says to Josie referring to her brother: "Oh he's buried out in the desert somewhere". There's the usual shooting the guns out of the outlaw's hands but the boys also appear to kill some of the bad guys. It was a mystery to me why the bad guys had to wear masks when they went up into the town. Who would recognize them in any event?
The chemistry between the three stars is what raised this trio above the other trigger trios of the day.