Joe Martin is a fire fighter in Los Angeles who is assigned to the Arson Detail.

Joe's predecessor in the Arson Detail was killed when investigating the same fire and his file with his findings wasn't recovered from his body.

This is just one of many suspicious fires in the last few years, where the insurance claims have been filed by the same agent, Frederick P. Fender.

He meets the babysitter, Jane, a young teacher, and Joe drives her home and ask her out on a date the next evening.

Joe is hired to do some work for Fender, and the following day he is to drive a car for Pete when he is setting fire to another store.

When Betty gets drunk she accidentally discloses the address where the furs are stored and after the dinner, Joe and Jane go there.

The police look at the file Joe brought and they find evidence implicating Pete in setting the fire.

Fender is alerted of the situation by a night watchman and tries to get there as fast as he can, driving with Betty by his side.

Fire trucks get the alarm and comes to the warehouse, and Fender crashes his car on the way, driving too fast.