I write about Albion, the magical community of Great Britain, currently between the 1880s and 1950. (Ireland is doing its own thing, magically.) There’s a tremendous amount of change in that time, in terms of medical advances, technology, communication options, and how people live their lives. At the same time, I don’t actually want to change history. Inserting magic into the landscape means thinking about what will and won’t be affected.

When I started writing, I knew I wanted to write about a magical community with a range of magical options. Just like with most other skills, I wanted what someone could do magically to depend on a combination of factors. For magic in my writing, that's a combination of talent (how easy it is for them to learn something), strength (how much they can accomplish with their magic), and knowledge (what they have learned about how to use magic). Someone with less strength but enough knowledge can still be incredibly effective, and someone with raw strength but no training has some definite limits.