Noun
person of interest (plural persons of interest or people of interest)
(law enforcement, chiefly Canada, US) Someone who police have reason to believe may have a connection to a crime, or to possess important information relating to that crime, but who has not been accused or charged by authorities nor been officially deemed to be a suspect.
The two characters start talking to one another in the Season 1 episode "A Person of Interest" when they both get creeped out by Toby's sister Jenna (Tammin Sursok). Source: Internet
Person of Interest streams on Amazon Prime Video. Source: Internet