Carter put her detective skills to work against HR on Person of Interest. Elsewhere, The Machine came up with 38 numbers for Reese and Finch to deal with.
On Person of Interest, Root recruits Shaw for a mission from the Machine. Elsewhere, Reese and Finch attempt to save an estate investigator, but a former foe returns.
On The Walking Dead Season 4 Episode 3, the plague continues to spread in the prison and Tyreese tries to deal with the loss of Karen. Meanwhile, Rick uncovers the truth about the murders.
On Person of Interest, Reese and Finch must determine if they are protecting a victim or hunting a perpetrator. Elsewhere, Carter continues to work with her new partner.
While the DPD gets close to solving McCann's murder, Frank is forced to make a critical decision on Low Winter Sun. Also, Damon makes his boldest move yet.
Reese and Finch recruit Shaw to help them with a sailor during fleet week on the season premiere of Person of Interest. Elsewhere Root makes some surprising revelations about the Machine.