Frances Neagley is a private investigator in Chicago and former military colleague of Jack Reacher in the Army's 110th Special Investigations Unit. When she learns that a beloved friend from her past has been killed in a suspicious accident, she becomes hell-bent on justice.
Jack Reacher, a veteran military police investigator, has just recently entered civilian life. Reacher is a drifter, carrying no phone and the barest of essentials as he travels the country and explores the nation he once served.
Cruz Manuelos, a rough-around-the-edges but passionate young Marine, is recruited to join the CIA's Lioness Engagement Team to help bring down a terrorist organization from within. Joe, the station chief of the Lioness program, is tasked with training, managing and leading her female undercover operatives.