People love to read or watch a good mystery.
There are even parties people have that are simply given to have the guests act out a fictional mystery. I believe a mystery is an event or occurrence that involves some amount of suspense and an investigation. A mystery contains some type of an investigation and can end with a solution or can be left unsolved. People are drawn to them for many reasons including the suspense it entails, the action, or the ability to try to find the solution in the end. There are some examples that I will introduce that prove my definition and my reasoning.