After Patterson discovers a hidden message in the New York Times crossword, she embarks on a tattoo scavenger hunt that leads her into danger. Oscar finally tells Jane more about who she was, and Weller seeks his Dad's opinion about who kidnapped Taylor Shaw.

In order to capture a dangerous international criminal, Jane and Weller are forced to collaborate with the only person he will meet: their former target, Rich DotCom. Jane must decide whether to risk hurting Weller by executing a morally questionable order from Oscar.

When a mysterious young girl with a tattoo connection falls into Borden's care, he brings her case to the FBI team -- but her ties to a terrorist organization prove dangerous for all of them. Meanwhile, a conflicted Jane starts to grow close to Weller again, and friendship blossoms between Borden and Patterson.

The FBI is locked down when criminal hackers infiltrate the building, trapping the team inside SIOC. As they fight their way out, the close quarters force Mayfair, Zapata, Reade, and Sarah to confront personal conflicts.