Person of Interest Sotto Voce video: Finch, Reese face old foe | EW.com

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Person of Interest exclusive clip: Finch and Reese's elusive enemy returns

(John Paul Filo/CBS)

Person of Interest is starting to tie up loose ends as the series heads into its final stretch of episodes, and Team Machine is hit by a blast from the past in this exclusive clip from Monday’s episode.

Reese (Jim Caviezel) and Finch’s (Michael Emerson) investigation into this week’s POI Terry Easton (Neal Huff) takes an unexpected turn when Terry receives a threatening call from one of their most elusive and dangerous human foes: the criminal mastermind known only as The Voice.

“Cleanliness is all,” says The Voice to Terry, repeating what The Voice usually says before he starts killing everyone involved in his operations.

In case you forgot: Finch first matched wits with The Voice in season 3’s “Last Call,” during which The Voice threatened to kill a 7-year-old boy unless a 911 operator deleted an incriminating call for one of his clients. After Finch foiled his plan, The Voice called him and promised that they would be seeing each other again, and it appears as though The Voice keeps his promises.

Check out the clip above to find out what’s in store.

Person of Interest airs Mondays and Tuesdays at 10 p.m. ET on CBS.