A Case of Possession — KJ Charles

Book 2 picks up shortly after where The Magpie Lord leaves off, although it probably could be read on its own, since it's a new situation that Lucien Vaudrey, Lord Crane, and magician Stephen Day are facing. Giant rats, to be specific, magically called and killing a swathe of people in London who seem to have no connection.

I like this one not quite as much as the first, but that's probably more about the rats than about the story. Ugh. I've had rat problems of my own in my garden and I live in NYC where they're ubiquitous in the subway tunnels.

I do love how Crane and Stephen's relationship develops, though.