I've been waiting to discuss the book in detail until more people to have read it because of the twist, even though the back cover kind of spoils it, but I will say I had the good/bad luck to start working my way through with the Engineering-based paths, so I found the spur into the "real" story fairly quickly (and also that, somehow, between the back cover being written and the book coming out, the Romulans turned into a bunch of Gorn), and it wasn't until I doubled back on a second read-through that I found Khan, Dionysus, and that one path where Boimler just kills Mariner out of nowhere.