Unable to locate Stroh in the present, the team searches for answers in his distant past; the squad struggles with Chief Mason; Rusty grows frustrated with his forced proximity to Gus.
Phillip Stroh and his young British accomplice edge closer and closer to their endgame; Lt. Provenza pushes Asst. Chief Leo Mason into pouring more resources into the case; Rusty unearths an important clue.
Lilly and the team investigate when the 1958 suicide of a radio disc jockey is discovered to be a murder; they must find the truth of his life by decoding a hidden message in his final broadcast.
After discovering new evidence, detective Jeffries re-opens a 1979 murder case in which he promised the victim's daughter that he would find her mother's killer.
Unable to locate Stroh in the present, the team searches for answers in his distant past; the squad struggles with Chief Mason; Rusty grows frustrated with his forced proximity to Gus.
Phillip Stroh and his young British accomplice edge closer and closer to their endgame; Lt. Provenza pushes Asst. Chief Leo Mason into pouring more resources into the case; Rusty unearths an important clue.
Lilly and the team investigate when the 1958 suicide of a radio disc jockey is discovered to be a murder; they must find the truth of his life by decoding a hidden message in his final broadcast.
After discovering new evidence, detective Jeffries re-opens a 1979 murder case in which he promised the victim's daughter that he would find her mother's killer.
The Machine malfunctions during a reboot and supplies Finch and Root with the numbers of dozens of people not involved in any crimes; Finch and Root are locked out of the Machine as it identifies them as threats.
