Just from the trailer, the backstory is already different than Mitch's backstory in the books. I hope they don't screw it up too much. I'd love to see more than one of these movies made if they can keep them straight. I read this book maybe 6 or 7 years ago so I don't really remember a lot of the details of this particular book, but the backstory is consistent and revisited often throughout the rest of the series.
In the books he is driven to anti-terrorism after his fiancee is killed in the Pan Am flight 103 lockerbie bombing. But in the trailer it appears to be a terrorist attack on a beach