Rubicon is a fun, quick read about an "immortal" soldier, her fancy combat suit, and the snarky AI in her brain. The book reads like a novelization of a military sci-fi FPS video game, complete with a combat scene that features the protagonist's squad facing off against a large boss creature after fighting off a bunch of smaller critters. I'm not complaining—this is exactly the sort of book I was looking for as a short break between longer series—but if there was a video game version, I'd probably recommend that you just play that instead.