These prequels are excellent for this time of year. They do take place in autumn, with Valentines occurring around Halloween, but more than that: thematically, they may pull more darkly.
Of Flint and Fortune released yesterday, and I'm immensely pleased it's out in the world. As I've said, it's the first part of a two-part arc; even though there will be a small wait between this and Of Valentines and Visions, it'll be worth it.