Shadows of Self is the latest Mistborn novel and the sequel to The Alloy of Law, which came out all the way back in 2011. It's been a crazy long time. There's been plenty of Brandon Sanderson to read since then, but my first love is Mistborn, so I've yearned for this for... well, four years. Fortunately, it's fantastic. If you liked The Alloy of Law--particularly the idea of an urban fantasy thriller set in the Mistborn world--you'll love Shadows of Self.
This time, Wax and Wayne continue their hunt for the Set, the shadowy organization seen in The Alloy of Law. Then, the murder of a huge portion of Elendel's criminal elite--including the governor's brother--pushes Wax onto the case, where he discovers that the person responsible is insanely dangerous. They need to find out what this person's plans are, before Elendel collapses in on itself.