A surprising visit from Nas leads the team to investigate a dangerous piece of technology that was stolen from the NSA. Roman and Blake grow closer as they attend a high-stakes poker game.
When Patterson's tattoo investigation results in a horrible incident, she tries to figure out what went wrong -- but quickly realizes all is not as it seems.
The team must decide whether to trust a prisoner who warns them of a dangerous plot. Zapata is caught between the FBI and the CIA. Roman and Crawford argue on handling a volatile situation.
A CIA source threatens to tear the team apart. Rich's place in the FBI is called into question. Roman and Crawford spend a day together under strange circumstances.
The team must partner with a conspiracy theorist to stop a deadly weapon from getting into Crawford's hands. Meanwhile, Roman struggles maintain his personal life with Blake while doing secret missions.
After receiving shocking news about Avery's father, Jane and Weller must hunt down an elusive criminal. Meanwhile, Patterson's father helps the team in the lab.