Dr. David Cornbleet, a beloved Chicago physician, is stabbed to death in his office one October evening in 2006. His son, Jon Cornbleet, can’t imagine why anyone would want to kill his father. While some physical evidence was left at the crime scene, the cops are most interested in the office building’s surveillance tape, which captured the figure of a young man whom they believe is the primary suspect. Neither Jon nor the Chicago police have any clue as to who this person is or how to find him. Jon vows at his father's grave site to do everything he can to find the murderer, but he knows his search will have to be unconventional. What will be his strategy? Jon decides to use a social-networking site to cast his net as wide as possible. He believes that someone, somewhere on the Internet, will have answers for him.