District Attorney Doug Selby speaks to young Ross Blaine who has forged a cheque. Blaine confesses it is to pay off a gambling debt at the local gambling parlor, run by Oscar Triggs. Selby and Sheriff Brandon pick up a vagrant and caution him. The vagrant is then found dead of carbon monoxide asphyxiation, but Selby suspects murder. As Selby follows up one clue after another, the vagrant’s death eventually leads to the smashing of a Los Angeles gambling ring and the local industrialist’s son being accused of manslaughter.