Onslow Stevens stars as insurance investigator Dan Adams, hot on the trail of gangster Duke Trotti (Noel Madison). As it happens, Dan's own brother Eddie (Allen Vincent) is in Duke's employ. Suffering an attack of conscience, Eddie decides to go straight and blow the whistle on Duke's operation, only to be pumped full of lead for his troubles. But Eddie's murder is the key that leads to the destruction of the villains, so it cannot be said that he died in vain. The hardly necessary romantic interest is provided by Dan's faithful assistant Carol Carter (Kay Linaker).