We pick up where we left on in episode 18 with Rush and Yates taking the lead on tracking down our serial killer who turns out to be Paul Shepard, son of the first serial killer Bill Shepard, who killed himself 30 years ago. Apparently Paul was with his father on that fateful day when he killed himself and Bill left his son a suicide letter. In the letter it identified all the people in Bill's life whom he felt let him down or mistreated him that he ultimately silenced. Rush learns why Yates has been pursuing this case so aggressively, she was the girl at the drive-in and her date, Barry, was Paul's first victim. Barry died in Yate’s lap. Our team discovers a pattern in the recent killings and realizes that Paul was following his father's killing pattern, silence everyone who let him down. In a race against the clock, Rush and Yates try to decipher all the people in Paul's life that may have let him down and track them down before it's too late. They track down Paul's cousin, Tom, who recently told Paul he had to evict him from his building where he ran a video store after he was unable to make the last six months of rent. However, when the team arrives at Tom's house it's too late. Further investigation reveals that Paul was having trouble paying for fertility treatments that his wife was about to receive. They track down the receptionist from the fertility clinic only to have shots ring out nearly killing her. In the end we find Paul back at home about to kill his wife, Claire, and then kill himself. Rush gets Claire to lie about being pregnant which convinces Paul to surrender.