Tom Mitchell is an insurance investigator and Fire Capt. Joe Dugan is chief of the police department's arson troubleshooters. Tom and Joe team up to solve a particularly vicious series of deliberate fires. A man has been killed in one conflagration, so the villains have a murder rap hanging over them.
| Actor | Role |
|---|---|
 Frank AlbertsonTom Mitchell | Tom Mitchell |
 Robert ArmstrongFire Capt. Joe Dugan | Fire Capt. Joe Dugan |
| GGrace AlbertsonJudy Mason | Judy Mason |
 Byron FoulgerAmos Baxter | Amos Baxter |
 Chester CluteSam Purdy | Sam Purdy |
| JJerry JeromeMike C. Crandall | Mike C. Crandall |
 Arthur LoftCyrus P. Clevenger | Cyrus P. Clevenger |
| RRod RogersNick | Nick |
| SStewart GarnerBill Roberts | Bill Roberts |
| FFrank WayneTracy | Tracy |
 Ed CassidyFire Chief O'Neill | Fire Chief O'Neill |
| CCasey MacGregorFireman O'Malley | Fireman O'Malley |
| HHerman ScharffRawlins | Rawlins |
 Ezelle PouleMiss McKee, Arson Squad receptionist | Miss McKee, Arson Squad receptionist |