This book keeps you guessing. And even if you think you've got it figured out, you probably don't.
And the subtle reminders of paranoia throughout the book, even from the beginning, were very compelling. It kept me interested and made me want to read more. It made me very uneasy whenever Mira would feel strange out of the blue, and reminded me to be suspicious of everyone in the car.
My only criticisms are that the action scenes were a little bit underplayed. They tended to blend in with the rest of the book, so it was hard for me to notice a difference between a calm moment and an action sequence.