Even though MJ-12: Inception wasn't a long book, it still took too long to get going. The last third or so I really enjoyed, but the parts before that were treading over familiar ground, a superhero/spy origin story that felt completely done to death.

Still, the end was good, the previously low stakes felt properly raised. If I could trust the story to keep up the pace it achieved, I'd probably be getting the sequels in a heartbeat.