Knife

The team re-opens the 2000 case of a prominent Puerto Rican assistant district attorney when rumors about his connection to a large amount of money gone missing at the time of his death start to circulate. However, his widow insists that the claims are not true. The re-investigation reveals that the victim was prosecuting a murder trial and the man convicted for the crime after his death may possibly be innocent.

The 1978 murder of a young man is re-opened after the victim's mother finds a letter suggesting that his death wasn't random.

The 1994 case of a raped and murdered 16-year-old girl is re-opened when Det. Jeffries gets a call from a prisoner on death-row -- scheduled to be executed in just three days.

- No, everyone's got their own point, see, their, their own bottom, when there's no place lower you can go but there. And when you hit that, you die. Or you close your eyes and believe.
- Believe what?
- There's something bigger out there than what's eating you alive. Something better.

When the body of a newly missing boy is found in a cargo container along with the remains of three other victims who vanished in 1999-2003, the team realizes they're dealing with a serial killer.