A criminal that Holmes and Watson brought to justice asks them for help to solve a murder, but they are suspicious. Is there an ulterior motive?
The Reagans' festivities are ruined when Henry is taken ill and the family worry they will lose their patriarch. Danny and Jackie also investigate a suicide.
An emergency disciplinary hearing at Quantico results in deep secrets being revealed; Alex and her team try to find the real bomber.
FBI computers are hacked, revealing confidential files that make Alex think a second bomb is somewhere in New York; the recruits receive individual assignments that turn out to be connected.
At Quantico, the NATS team up for defensive driving lessons while tensions between Liam and Drew explode, resulting in shocking admissions and consequences.