I feel like this one is the best of the spin off books after Harper/Knox's arc ended. My only real complaint is that there's so much here - the angels, descendants, how they're cursed, Raini's gifts, etc - that one book wasn't time to get into everything in any more than a superficial way. This would have benefitted from being a side series, a couple books to really dig into angels, descendents, "upper management", etc in a more detailed way. I wouldn't even have minded Raini/Maddox taking a whole book to really connect, given how standoffish Maddox was.