Fiona helps a CIA asset who is being targeted by a black-market businessman, while Jesse and Sam infiltrate a mercenary training camp and attempt to track down a sniper.
Kate and Abby warily join their childhood friend Eve to pursue the ruthless child sex trafficker who was responsible for their partner Gloria's murder.
McPike and a disbarred federal prosecutor (Steven Bauer) conduct an unauthorised investigation of Vinnie's disappearance.
Santana learns the details of Guzman's money laundering operation and comes face to face with the drug lord who cost him his job as a federal prosecutor.