Mystery is a large genre, and like fantasy has subgenres inside of it. Here is a quick overview of some of the subgenres.

Masterclass defines a cozy mystery as a story that "embodies the key components of classic mystery novels—suspense, misdirection, intrigue, and some degree of criminality—while eschewing the graphic violence and profanity that is often embedded in pulpier mysteries." It has become a popular sub-genre of many crime novels, and if you're looking to write a more family-friendly mystery it's the perfect way to go.