If there's one thing Person of Interest knows, it's that you can't start a war without having casualties.

So, on Tuesday's Season 4 finale (10/9c, CBS) — which features Finch (Michael Emerson) and Root (Amy Acker) trying to get to the Machine's location before Samaritan's operatives do while Reese (Jim Caviezel) continues to navigate a battle between rival gang bosses Elias and Dominic — you should expect a pretty big body count.

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How big? "The finale features the potential death of up to three major characters," executive producer Jonathan Nolan teases.

But perhaps more surprising than the deaths is the show's latest shift in terms of how bad the "bad guys" are. And before you jump to conclusions about who might meet an untimely end, you might be wise to also consider what could be lost in the battle. Let's just say the show, which has yet to be renewed for a fifth season, ends with a cliff-hanger that could be maddening if the renewal gods don't shine on Person of Interest.

What do you think will happen in the finale?

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