Our CSIs investigate a series of sniper shootings and Mac discovers their lead suspect is a former kidnap victim whom Mac rescued after three years of searching. Blood evidence at the scene of one of the shootings brings Mac back to the case of a missing boy he helped find over 15 years ago, Michael Reynolds. Mac knows Michael suffered severe trauma at the hands of his kidnapper but is shocked to think he is now a killer. The team goes back to Michael's parent's home and find Michael dead, shot to death. Hair found at the sniper's crime scene matched Michael's mitochondrial DNA; Mac knows they the shooter is Michael's brother Tom. Tom felt like he was in Michael's shadow all of his life. His parents were always preoccupied with Michael and helping him get through his trauma but neglected Tom in the process. Tom's sadness turned to rage over the years and he now wanted to make himself known. Our team rushes to figure out Tom's next target and doesn't have to wait long when he begins shooting at innocent bystanders from the roof of a Midtown hotel. Mac tries to reason with Tom and bring a peaceful end to this tense standoff but when Tom shoots an officer, Mac must take a shot and hits a box of exploding ammo which immoblizes Tom. The team takes him into custody and save the officer's life.