Johnny prepares his first expense report items as his flight nears his destination. The passengers are all abuzz when a man who swiped Johnny’s overcoat was pushed overboard. In London, he is on the track of a missing painting. The client is a man who has a travelling art display with a rotating stock of paintings to show. With the story of the travelling museum told, the client has to leave on business to Paris, and Johnny goes to check the museum out.

Johnny begins to think the misadventure on the airplane may have been an attempt on his life. Is he in danger, and if so who would want to harm our sweet little old insurance investigator? More information comes from the lovely art assistant who shows Johnny the blank wall where the painting once hung. Johnny is off to Scotland Yard to get the official police report. Though the painting has been reported missing, no serious charges, or investigations are being pursued.

He compares notes on the list of suspects the girl from the museum gave to him to see what the cops know, but they seem surprised that anybody is doing any serious investigation. Johnny has another near miss when a car nearly runs him down.

The expenses pile up as Johnny tracks down the list of known theives. He finds what appears to be a missing painting, a body, and some fresh gunshots coming his way. With the painting found and in the hand of the cops, the insurance investigation seems about over, but Johnny wants to learn who has it out for him.

Johnny’s intimate conversation with the lovely Muriel is interupted when his insurance company calls him. They claim that the missing frame is at least as valuable as the painting itself, so Johnny is back on the job. Now however, he has a little more to go on, and heads right for the wood shop where the key evidence to wrap things up is found. What is it that links the murders, and attempts on his life with the missing artwork? Is Muriel behind it, or somebody else?

The secrets of the case come out, but Johnny isn’t out of danger quite yet.