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During a joint live-fire training exercise involving a drone (armed with two missiles) and forces on the ground at the Marine Corps Base, Camp Pendleton, California, someone or something causes the drone to change its course, launch a missile, and kill a sergeant (a drone coordinator); the drone and its second missile disappear; the pilot of the drone is an Air Force captain at a base elsewhere in California; the Callen team investigate. G and Sam take part in a conversation which never happened; Eric finds the face of the finder of the drone; G and Sam find a suspect and a surprise, then Dom finds another suspect and another surprise; Kensi learns about family interrelationships, then G and Sam stop an empty truck. Eventually the team put the pieces together, then G and Sam board a yacht and discover a pilot at work while Eric holds a fire drill at a high school and disposes of a weapon. Everything works out.