The Great Jewel Mystery

A group of thieves are building a fake coffin as part of a plan to steal a jewel case filled with extravagant and expensive gems. With one of the thieves inside, the fake coffin is loaded into the railroad car that is also carrying the jewel case. After the train gets moving, the thief comes out and steals the contents of the case. When the theft is discovered, a search for the thieves begins.