I was expecting Vivenna to be in the book, so I was actually wondering if it was Evi for awhile (some of her idioms don't translate properly to Dalinar), but her character didn't seem right (too meek, maybe a little dull). But the second Azure showed up with an odd sword, I was pretty sure, and then Brandon kind of beats this one into you so there is no doubt.
As someone raised on Agatha Christie and who loved Inception, I spotted the first twist of it being a snapshot of a snapshot fairly easily, but I had the crime wrong. I assumed the "domestic disturbance" they were responding to had something to do with him killing his ex-wife. Good story and I could definitely envision this being turned into a good movie.