Kitten lets Hank know she fears for her life. it's difficult to know if she has found someone who will help her. Hank is a mixed-up dude.
if the book has a twist, I suppose it would be Kitten's death at the hands of someone other than Viv. but I have no idea where any of this is going, or even if there will be a murder on this train, or who would be the victim.
I'm close to saying "if you did not like The So Blue Marble, you probably won't like this one", but I'm not quite there yet. we're heading in that direction. sorry. (of course, I kind of liked Marble).