Nothing special about the book stood out to me, it was predictable at its best and boring at its worst.
If you're a little less well-versed in thriller tropes, you may like it, but the letter Verity wrote at the end may or may not undo all of the goodwill and benefit of the doubt you've given the book until then.
Quite frankly, I felt no need to have four pages of the book taken up with a play-by-play of Verity's pseudo redemption, explaining her every thought. But, to each their own.