Steve Liskow, Nowhere Man 

I have a bad habit of buying things for my Kindle & then forgetting about them. But in the last couple of days I read Steve Liskow's "Nowhere Man" and read it in two sittings. The main character is a PI (ex cop) Zack Barnes) who gets hired by the widow of a wealthy (and deceased) businessman. She wants him to check out the man who seems to be cyber-stalking (which may be too strong a description of the events). In some ways it's not something I usually get caught up in--I tend to shy away from stories which have too much to do with the PI's personal life--but this one incorporates the personal with the investigation nicely. And the conclusion is explosive. On of the best I've read so far this year.