Michael Emerson, Amy Acker Michael Emerson, Amy Acker

The season finale of CBS' Person of Interest will literally be a race to the finish.

In the penultimate episode of the show's sophomore season, Reese (Jim Caviezel) and Finch (Michael Emerson) learned that The Machine had taken extraordinary measures to protect itself from a virus that was designed to take The Machine offline. Once the virus took hold, The Machine made two phone calls — one to Reese and one to Finch's hacker nemesis Root (Amy Acker) — potentially giving them access to The Machine's secrets for 24 hours. So, who capitalizes first?

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