NCIS investigates the death of Corporal Ray Collins when his body and severed feet show up in a dumpster. His watch GPS lead us to a huge box truck where in the back we discover a cutting table and the hanging remains of ten severed human feet. All of our victims were part of a motorcycle gang as indicated on the tattoos on their feet. We realize that we have a serial killer on our hands and all evidence points to Collins as being the mastermind behind the killings. It's discovered that Collins was working for the Mexican drug cartel and to prove that he completed a hit he had to bring back the victim's severed foot. Collins must have gotten in the way of the competition and was killed the same way he killed his victims. Our doer turns out to be the initially cooperative bar owner, Velvet Road. At the request of Alejandro Rivera, Justice Department in Mexico, Abby is invited to speak at a law enforcement symposium in Mexico. Vance tells Abby that McGee will be her escort. While in Mexico, Abby debriefs the students on a 20 year old cold case where drug dealer Pedro Hernandez was gunned down and killed. While at the crime scene Abby, McGee and the students are cornered by Paloma Reynosa, head of the Reynosa drug cartel. Paloma realizes why Abby is there and offers Abby the sniper bullet attached to a necklace around her neck. She and armed men drive off. Abby request that they exhume Pedro's body and fly it back to DC for further investigation.