Over the past two months, four men have been murdered in their Houston homes. Each victim was killed on a Sunday evening, and in each case nothing apparently was stolen, and inexplicably, different guns were used in the four murders. The police have no witnesses and no suspects.Rhett Sanders, owner of a local marketing research firm, is visited by the parents of the latest victim who plead with him to investigate their son's murder. Their son participated in a recent survey conducted by Rhett's firm, and they had read the publicity Rhett had received for using his research to solve murders in the past. Rhett had promised to give up being an amateur detective, but the despair in the faces of the grieving parents, along with his desire to do the right thing, motivate him to get involved. He and his girlfriend, Toni, and his best friend, Chris Beck, undertake an investigation, believing they can solve the case if they can discover what else the victims had in common other than the way they were murdered. Their heart-stopping investigation takes them to the small town of Schulenburg, and along the way some unexpected twists present grave threats to the well-meaning amateur detectives.