A caper is a comic crime story. Instead of suave and calculating, the caper chronicles the efforts of the lovable bungler who either thinks big or ridiculously small. Finally we get to laugh.
One of the newer forms, centered on the commission of some type of crime or scam, usually outrageous and frequently humorous. Will it succeed, and will the scoundrels get away with it? Gives us an opportunity to root for characters we might not root for in real life.