Orphan Black's Sarah is on a quest for the truth, and a brand new clone may be the key cracking her case wide open.

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The BBC America series will introduce yet another of Tatiana Maslany's clones as season 4 begins, and the slippery M.K. will know far more about Project Castor and Project Leda than any of her sisters. Unfortunately, a traumatic past will cause M.K. to keep her lips sealed shut...for now.

"She's very paranoid. She's very security conscious. She knows more than Sarah does so she knows how dangerous the whole thing is," co-creator John Fawcett told Entertainment Weekly. "She's purposefully avoided contact with the sisters to keep herself safe, and Sarah is now trying to draw her out of the shadows and trying to utilize the information that she has so that Sarah can follow her own mystery..."

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Will Sarah be able to connect with this Deep Throat-esque clone, or will M.K. keep the sisters running in circles? Only time will tell.

Find out more when Orphan Black returns to BBC America this April. Click the video below to see a season 4 teaser.

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Orphan Black, Television, BBC America