THAT is what we could call a game-changing episode.

A week after taking Carter to a new level, turning this police officer into a well-rounded individual with motivations and goals and a task of taking down HR, the CBS drama shocked viewers around the country.

By killing her off.

It was a twist we did not see coming and it leaves open a number of possibilities when it comes to the future for Finch, Reese and the entire team.

We'll be reliving the haunting phone ring toward the end of Person of Interest Season 3 Episode 9 for a very long time. Watch the installment from start to end now: