Where can I watch Alert: Missing Persons Unit in United States?

When police officer Nikki Batista’s son goes missing, she joins the Philadelphia Police Department's Missing Person’s Unit (MPU) 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, Jason Grant, a former police officer, shows up with a proof-of-life photo of their missing boy. Or is it?