When a routine school field trip ends with a missing child, alarm bells ring for all involved. In “The Field Trip,” an episode of “Tracker,” the search for young Alex reveals how quickly the safe and familiar can become sinister.

A New York mother awoke to her 12-year-old child missing, sparking a desperate search. Authorities soon found the girl in the Finger Lakes region with an out-of-state man suspected of grooming and assaulting her.

Washington authorities have issued an Amber Alert after a one-year-old boy was forcibly taken from his mother in Port Orchard on Sunday, prompting an urgent search for the suspect and child.