Click on the graphic to be taken to the series page on Amazon. They work fast to keep the series updated. You can find the official list and their order on the Current Books List page.
To learn more about the series, check out the ghosts' website. http://ghostsofcullodenmoor.weebly.com Yes, they have their own, though we are woefully behind on getting all their information added. In the end, it should be quite impressive, but for now, you could learn something you may not have read in the books.