During his month-long vacation from his job as newspaper photographer, Flash Evans travels to Indianapolis to watch the car races, accompanied by his friend Joe Wells, who is going to Indianapolis to meet his NewsVue partner. The train derails, and Joe is injured and unable to walk. He asks Flash to take his place temporarily at NewsVue.

Flash is welcomed coldly and reluctantly by Joe's partner, George Doyle, but he takes great photographs of the races and is praised by Doyle's boss. Flash learns of the death of Albert Povy, a spy who is suspected of stealing government secrets for use by his own country. Oddly, Povy's body is claimed by Herbert Rascomb, an upstanding citizen who seemingly has no connection to Povy. Flash senses a mystery, and his investigation reveals an amazing plot with Rascomb at the center. Rascomb proves to be a deadly enemy, and Flash faces grave danger until Rascomb is apprehended.