A few of the trickiest ones have gone viral, like the “Mr. Smith had four daughters” riddle. Many people have been totally stumped by this riddle, and they want to know what it means.

One such riddle is “Mr. Smith had four daughters,” which has puzzled many. But this isn’t the only one making waves online.

The audit says Mr. Riddle, who resigned in January, bought an expensive Dodge Ram and traded it for a newer truck and also acquired two other expensive vehicles during the period 2005-2009.

Indeed, as veteran true-crime watchers know is often the case, the killer was, in fact, the victim’s spouse: Mr. Smith. Like all good detective riddles, the “Who killed Mrs. Smith?” ...