One world. 63 million psychics. 63 million stories. “NIGHTINGALE," Part One—Cristina Fierro is one of the CIA's best black bag operatives – but how can a killer hope to retain her sanity, when, as an empath, she feels every bit of her victims’ pain and terror? When she goes rogue after a mission in South America, her handler, the telepathic Agent Hanley, is the only one who can stop her before she turns Denver into a slaughterhouse.