The best thing about my book

I'm reading Safe Haven. The best thing about my book is it keeps you guessing. It also has a lot of suspense. You never know what what her old husband is going to do next. Is he going to kill her? Try to hurt her? Do something to her new family? You just really never know. But the author keeps giving you clues that leads up to the actual moment. This makes the moment more suspensful. I like suspenful books but not to suspensful. Is your book suspensful? Does it keep you guessing?