This case from the files of your FBI gives ample illustration of the basic inherent difference between the criminal and the decent citizen. The decent citizen upon finding himself in possession of something that doesn't  rightfully belong to him makes every attempt to see that the property is returned to its owner. The criminal on the other hand has no such impulse. 

To the criminal getting something for nothing is the only important thing, but getting something for nothing is an impossibility, there is a price to pay, and often for him it can be his life.

In this case Your FBI solve two related crimes, the Philadelphia jewel theft and the murder of Tom Wells.