Without a Trace is an American television show set in New York City. The show is about an FBI missing persons unit; each episode typically follows the investigation into one person's disappearance. (The unit is fictitious; the real FBI has no dedicated missing persons unit, but investigates disappearances as needed on a case-by-case basis.)
Shows that I can't find streaming, at least on the legal sites that are free or that I have subscriptions to (CW seed, CW, CBS All Access, Hulu, Netflix, Crackle).