I found this to be an intriguing story. The idea of a stalker and the things that happen to Ali are very realistic. I can see them happening. I like the way Ali grew as a character and the ending was a satisfying one. Her character, along with best friend Jacy, were nicely developed. I was a little disappointed that the other characters weren't developed as well. Her friends were a mixed bunch, and there were some insights into their personalities, but they leaned toward the flat side.
The choice for the stalker was a great one. I figured it out when the first clue was given and waited to see if I was correct, or if it was one of the red herrings thrown in here and there. I devoured the book in one sitting which is why it got the extra half star. The writing was tight and a nice pace was achieved, however I didn't love any of the characters, nor root for them. It was extremely entertaining, it just didn't draw me in. I can't give 3.5 stars here but I found it more than three but not quite four.