A professor comes up with a system to win at roulette, and goes to the famous casino at Monte Carlo to try it out. When he turns up murdered and his "system" missing, a reporter sets out to find the killer--and the system.
The famous singer Antonia left the stage to marry a country gentleman. She goes alone one day to Budapest to see again the operetta which revealed her and outlines a flirtation with an aviator engaged to her niece.
A miner who was swindled out of his mine by a banker turns to robbing stagecoaches. Several years after he is tracked down and killed, his son comes to town to tangle with the banker.
Edith overhears Bart's plan to rob the bank so she informs Ken. But she is also overheard and when Ken goes to investigate, Bart's Henchman Prod frames him for the robbery.
A fast-talking boxing manager and the somewhat hapless fighter he manages happen to run into a young man who was a good prizefighter in his day but is now out of the sport and has a drinking problem.