I'd give this one 3.5 stars, and maybe even 4 for its genre, which I'd describe as "modern thriller" along the lines of "The Girl on the Train" or "Gone Girl." It's a fun summer read with short chapters and a good bit of intrigue. It could've been even stronger if it hadn't been so over-the-top (in a VC Andrews/Flowers in the Attic kind of way) in employing sex as a plot device. Even so, it was a fun fast read.