CW这一版根据1990年法国电影《尼基塔女郎》、1993年美国翻拍版电影《尼基塔:永不回头》及1997年由美国和加拿大联合制作的电视剧集《尼基塔女郎》改编而成。 Nikita(李美琪 Maggie Q 饰)因抢劫商铺拒捕失手杀死一名警察,而被送到了女子监狱。后被代号为“Division”的秘密政府组织解救。组织伪造了Nikita的死亡证明,并赋予她机会开始新的生活——把她训练成一名间谍和顶级杀手,让她效忠自己的国家。可就在组织杀死了她的爱人后看清了一切真相逃离组织。躲藏三年之后她重出江湖,决定不惜一切代价揭发组织的阴谋和秘密。另一面,她安插了内应Alex(琳德西·冯塞卡 Lyndsy Fonseca 饰)进入组织内部做卧底。而Michael(夏恩·韦斯特 Shane West 饰)是追捕尼基塔小组的负责人,却与她有一种惺惺相惜的感情......When she was a deeply troubled teenager, Nikita was rescued from death row by a secret U.S. agency known only as Division, who faked her execution and told her she was being given a second chance to start a new life and serve her country. What they didn't tell her was that she was being trained as a spy and assassin. Throughout her grueling training at Division, Nikita never lost her humanity, even falling in love with a civilian. When her fiancé was murdered, Nikita realized she had been betrayed and her dreams shattered by the only people she thought she could trust, so she did what no one else before her had been able to do: she escaped. Now, after three years in hiding, Nikita is seeking retribution and making it clear to her former bosses that she will stop at nothing to expose and destroy their covert operation.