Causes of Action — John A. Miller

Claude McCutcheon wakes up one night to find a crying four-year-old boy standing in his living room. In his hand is a note from Jesse Hamilton, an old army buddy of Claudes whom he hasn't seen in 25 years; it reads "This is my son. Take care of him." When Claude sets about finding out what would compel Jesse to leave the boy with him, the trail leads him to a company called Sentinel Microsystems -- and turns deadly.