A woman is cleared of murdering her cheating husband by DNA, despite the fact she confessed to being the murderer. As the team search for answers, the phantom murderess may be involved in 21 other crimes. However, the top suspect is only accountable for 3 of the 21 crimes, and is cleared of a fourth by that crime being committed at the exact same time as another. Who or what caused this? Meanwhile, Don's behaviour is called into question after he nearly gets himself killed by hesitating during the armed arrest of the suspect.
—movieguy3