After Crosby's old army buddy is attacked in an apparent drug deal gone wrong, the team's quest for answers uncovers a dangerous web of conspiracy. Also, Jess questions his relationship with Sarah after an unexpected encounter.

The team attempts to hunt down a family annihilator before he continues his murder spree. Also, Barnes’ intrusive mother puts pressure on her marriage.

When a wealthy East Hamptons couple are killed by a female con artist posing as a personal trainer, the team works to find out her true identity and track her down. Also, Ortiz is put in a tough place when Hana's brother asks a favor.