Watch Alert Missing Persons Unit Season 1 Online Free. When police officer Nikki Parker’s son goes missing, she joins the LAPD’s Missing Person’s Unit (LAMPU) to help other people find their loved ones, even as she searches for her own. Six years later, her world is turned upside-down when her ex-husband, Devon Zoellner, shows up with a proof-of-life photo of their missing boy. Or is it?