The Great Swindle (1941)

"TRAPPING FIREBUGS..With Evidence To Burn..And Thrills To Spare!"

In this mystery, an insurance investigator must find the arsonists behind the burning of a warehouse. The detective does get some good photographs as evidence, but they are stolen from his apartment. He really isn't a great sleuth and winds up accusing everyone but the real culprit of the crime. As a result, he loses his job and must perform the investigation on his own.