The Conductors

This is an alternative history story about people helping slaves to freedom. In this reality, there is magic. Fascinating magic, based on constellations. There are also other kinds of magic, healing, and sorcery, and probably other kinds as well.
The story follows a couple of “conductors”, Hetty and Benjy, and I love these people :-) The side characters are wonderful as well.
It's not only about the freed slaves, it's also a murder mystery.
I know I'm not making much sense, this is probably a very bad review, but I love this story, and I cannot wait to read more about these people and this world.