CoM is a modern day fantasy series that's like combining the investigative mystery and magic of The Dresden Files, the more realistic superheros of Watchmen, the grit and crassness of SIn City, with a splash of humor (ranging from light hearted to over-the-top goofiness), and a touch of horror, nothing too gruesome.
It sounds strange, I know. However, it's a long running series where I don't throw all the info at you at once, you aren't forced to consider all these notions together until something has either been resolved, or explained well enough to move on.
The other question I get, and I find it silly to ask the writer, is "Is it any good?" Here's my answer:
Books 1-3 bounce in and out of the Amazon bestseller list, they might actually stay there if I paid for advertising, or had the time to really push them. The lowest rated book is 4.5 stars. If you want a better answer than that, read the reviews on there.
Hitori, which is a standalone story, but part of the CoM world, started off on the bestsellers list on Amazon and, at the moment is still on it in the UK.
I don't like to toot my own horn, it bothers me and makes me feel dirty. I will, however, state provable facts with no issues. So, if this series is new to you, check it out. The books all have samples available to read.