The Last Laugh is a Hardy Boys novel in the Casefiles series. It was published in 1990.The Last Laugh at WorldCat
Plot
The famous publisher of Zenith Comics, Barry Johns, is kidnapped from the San Diego comic-book convention by characters Human Dreadnought and Flame Fiend, observed by the Hardys. Joe and Frank think it was a publicity stunt, but then a kidnapper destroys a valuable art collection.
References