An ordinary woman doesn’t realize she’s been genetically engineered to be the perfect black ops assassin.
She can’t be caught. And even if she is, there is no way to link her to any action because she doesn’t even know she’s the killer. Heck, she doesn’t even look like their agent. Or even have the same fingerprints!
Now she is considered a threat to her own agency, and she finds she doesn’t like her other self very much, either.