When a Marine photographer disappears prior to giving a testimony in an Army court-martial hearing, the NCIS team investigates both the murder he witnessed as well as his current piece on homeless military veterans who are sleeping rough in the D.C. area but things take an intense turn when the photographer is later found dead, having apparently died of a drug overdose. The investigation changes when Ducky later discovers that the victim was unconscious before he was given a lethal injection of drugs, confirming that the victim was murdered and evidence soon emerges, suggesting a human trafficking ring that's secretly operating in the D.C. area is active with the homeless veterans themselves being possible guinea pigs. As this happens, Abby tries to help a young female teenager who's livin