The Body Finder by Kimberly Derting
Cuz I'm a giver like that.
I really think you're gonna like this one, but I do have to give a little "Reader Discretion Advised" warning: it does contain some language. There's some "A" words, some "B" words, some "C","D", and "E" words, and maybe even an "F" word or two. It also has a healthy dose of gratuitous snogging, along with murder most foul.
Having said that, I wouldn't recommend it if it was excessively graphic. It is a Young Adult book, and I'd put it in the PG-13 category. Still, if you have younger readers that like to read what Mom's reading (sorry Meghan), you might want to read it yourself first, and then decide if it's appropriate for your kid. I do have an alternate recommendation for anyone that is worried about the above advisory.
Imprints by Rachel Ann Nunes
I just read about it in the "Books" section of our Sunday paper. The plot line sounded amazingly similar to The Body Finder, but it was written by an LDS author, and the reviewer called it "a clean, enjoyable read".