Richard Marshall has generously offered me a place to review books on democratic theory at his 3:16 AM site. My first review, of Lee Drutman's Two-Party Doom Loop is now up.
I expect the next three (in some order or other) will be Brian Christopher Jones' Constitutional Idolatry and Democracy, Yascha Mounk's The People vs. Democracy, and the forthcoming Huemer/Layman "debate book" on whether government authority is an illusion. And, while it's not strictly a book on democracy, I'm thinking I might not be able to resist writing something on Peter Graham's Subjective vs. Objective Moral Wrongness.
Keep an eye out!