[s19e15] Thick As Thieves Apr 2026

NCIS investigates the murder of Navy Petty Officer Danna Calley, a "possum-loving" sailor found dead in Philadelphia.

While Billy was a "bad boy" in their youth, he is now reformed and owns a market in Philadelphia, highlighting a "Thick as Thieves" bond that transcends their different life paths. Key Scenes and Highlights [S19E15] Thick as Thieves

The team works in Philadelphia, providing a change of scenery from the usual DC backdrop. NCIS investigates the murder of Navy Petty Officer

The investigation uncovers a link to Alden Parker's delinquent past. Parker's former childhood friend, Billy Doyle, is connected to the suspect, triggering a trip down memory lane for the new team leader. is connected to the suspect