Mysteries are all about twists and turns and misdirection. There is often danger. There is almost always a dead body or two. So where does “cozy” come into it?
The Cozy is a pretty popular mystery sub-genre with a pretty specific set-up. They are generally set in a small town or village, with an amateur (meaning not professional law-enforcement or a PI or anything) sleuth, although they will always have some sort of connection, official or otherwise, that will allow them to gather information on the case. The sleuth is almost always a woman… and not infrequently of the grey-haired, grandmotherly variety. The murder – there is always a murder – is over pretty quickly or happens before the book begins and someone just finds the body to kick things off. There is little to no additional violence. Think Murder, She Wrote for a good, well-known example.
And that’s that. Although, if you are intrigued, this sub-genre has a bunch of subcategories (animals – often cats, crafts, cooking, etc.) all its own so you can delve pretty deeply into the cozy rabbit hole if you should so desire. And, as always, the library is a great place to start.