It's another TJ Klune book. I didn't like it as much as the House in the Cerulean Sea. The protagonist is supposed to be "bad" but not-really-a-spoiler, redeems himself. Except unlike Cerulean, where there's a slow change of someone discovering themselves (albeit with a lot of foreshadowing), in this one we have one scene of Wallace being bad, then a few chapters of being dead and confused, and then he's nice.