At Dusk (an Alex Troutt Thriller, Book 5)

Eyes are the window to the soul...unless there isn't a soul to be found. A little boy makes his first kill-and he likes it. He is cunning, charming, and without remorse. He is a sociopath. As boy turns to man, what lies inside takes root. He will make a mark on Boston unlike any other, and FBI Special Agent Alex Troutt must figure out how to stop him. But when she and her close-knit team move in closer, the stakes become much higher as the case takes on a more personal tone. It's a frantic race to stop a manipulative killer before his web of deceit and destruction escalates into a blood bath of haunting proportions."