Two fake paramedics abduct Lt. Warren Miller and his grandfather. Master Sgt. Louis Miller, from a nursing home. Nate gives Kensi a psych eval, and approves her returning to work. Callen and Sam find Miller in the abandoned ambulance, which Callen hot-wires to drive it to a hospital. Hetty sends Deeks and Kensi undercover at the retirement home. Hetty talks to Callen bout his sister Alex and his father Garrison. Deeks recruits an old friend of Hetty to distract the staff so Kensi cut hook NCIS into the home's closed-circuit feed. Callen discovers Garrison had kidnapped Pacey Smith, Alex's drug-dealer baby daddy, and stuffed him in his trunk. Sam plays host to Secret Service Agent Deschamps. She tells him Miller may possess a $7.5 million coin. Deschamps identifies Edward O'Boyle as the man who was lingering outside MIller's room. Deeks reveals O'Boyle is cheating at poker, and he attacks Deeks with a cane. Kensi captures his accomplice Ginger. Callen finds out Pacey is a criminal informant for LAPD. O'Boyle and Ginger recruited Malcolm Ariano, a part-time worker at the home, to help them find a buyer for the coin, and he double-crossed them, lining up a South African buyer, Desmond Visser. Sam and Deschamp find Miller inside, but they come under fire. Sam throws an oxygen tank in the air, and Deschamp shoots it, taking out of the gunmen. Visser's men are pursuing a bus from the retirement home heading for a nearby casino, chasing the coin. They force the bus off the road. Hetty calls out military reinforcements. The military senior citizens kicked Visser off the bus. Miller told Deschamps the coin is buried with his son. Both Eric and Nell reveal to each other that they're both seeing Nate as their psychologist. Callen and Garrison tell Alex their true identities. Hetty finds out Granger has left the hospital.