First of all, I love mysteries and thrillers because they offer the built-in drama of life or death. The stakes can’t get any higher. There’s also crime fiction for every taste. It can be as cozy or as bloody as you like. The mystery can be solved by cats or shape-shifters, amateurs or professionals.
Mysteries and thrillers are also democratic - appealing to most people at some point, if only as a beach or airplane read. It’s one genre that attracts a wide following. Most men won’t read romance. A lot of people won’t read westerns or horror. But almost everyone will read a mystery or a thriller.
Making sense of the senseless
All too often, real life often doesn’t make sense. Events happen randomly. You get a great new job, your best friend gets cancer, someone breaks into your car and steals one boot, you go to to the grocery store, you find a five-dollar bill in the bushes. There is no story arc.
It’s not always darkest before the dawn. Sometimes there is no dawn.
Real crimes are usually senseless and stupid. A lot of murders involve, not a criminal mastermind, but rival gang members, people selling drugs, men who can't believe their wife or girlfriend can really be leaving them, or someone who is far too drunk to be driving, let alone handling a gun.The murderer may not be a black-hearted villain and the victim is not always lily white.
The randomness of life is one reason why the more predictable patterns of fiction are so appealing. And in a book, you can usually count on there being a good guy. A good guy who wins at the end. He may be bloody and bruised, but he still wins.
There is something very satisfying about writing or reading those kind of stories.
Using brain, not brawn
In a mystery or a thriller the crimes are usually clever, involving layers of deception. Each one is slowly peeled back to reveal yet another layer.
In the real world, killers are not often geniuses. The predator who manages to keep several steps ahead of the cops, or who plays a mean game of cat-and-mouse, is not a staple of real life. How much more satisfying for a reader to mentally match wits with a mastermind, not some mope with a gun.
And as a writer, it’s even more fun to think up a complicated, convoluted crime.