When a marine is shot, the team investigates. They start by talking to him, he tells them that he went riding and he got shot probably by a hunter. They check out his story and learn he wasn't telling the truth. They go back to see him but he left the hospital, not fully healed. They learn a relative came and helped him. They see the relative, who doesn't know much but they find a bag filled with drugs. They think the bag belongs to his son. So they try to talk to him but he disappeared. They think the boy was asked by a drug ring to deliver the drugs but he changed his mind which means his father is trying to protect him. But the gang will stop at nothing to get them, so they try to find them. When Kai's father doesn't see his doctor, Kai needs to put aside his feelings to help his father.

La evidencia para encerrar a un capo de la droga es robada, Lucy se infiltra en un torneo de póker clandestino para descubrir qué jugador de alto nivel está detrás del crimen. Los sentimientos de Lucy están en conflicto cuando la exnovia de Whistler llega a la ciudad.

Después de un susto cercano en una explosión en un laboratorio de metanfetaminas, el equipo de NCIS descubre que uno de los suyos está siendo objetivo. Lucy se enfrenta a su primer gran caso a bordo de su portaaviones.