Carrie catches a deadly assassin who has eluded her before, but must put her personal vendetta aside when it’s revealed that the woman has vital information to prevent a terrorist attack on New York City.

Carrie's high school reunion is suddenly cut short when an alum shows up dead. Carrie has to remember back 22 years to understand the events that led to this crime.

Things heat up for Carrie when an old flame and a murder investigation lead the Major Crimes team to Atlantic City, NJ.

Capt. Russo is suspected in the murder of an informant, leading Carrie and Al into a cat-and-mouse game with a corrupt former cop.