Four Years Gone (Carlos McCrary) by Dallas Gorham

Carlos McCrary is asked by his Aunt Carrie to again investigate the disappearance of her daughter. PI has little hope of being succesful. Still, he flies from Florida to Texas and finds some new clues that get him involved with a dangerous pair of psychopaths.
McCrary isn't the most original PI in the world. He used to be a Green Beret and has two sidekicks who he asks for help during the case. The sidekicks don't add much to the story and get very little time on the pages. Also, there's some chapters from the POV of the victims and criminals, a device that I'm not fond of.
The story is written professionaly enough, though. Also, there is enough action and danger to satisfy readers of PI novels AND thrillers. So, not a favorite, but good enough for me to pick up more books in the series.