This is a delightful collection of very short mysteries. Each story is about 6 pages long. A group of 3 friends discuss a topic, a slant on it arises, a fourth one, Griswold, tells a mystery associated to it, chellenges them to solve it, which they fail to do, and then explains it to them. And there are 30 of these here! To be sure, they are of a light nature, which is understandable due to their length, but make for a quick, entertaining read.