'Northern Spy' unravels the tale of two sisters, Tessa and Marian, whose lives are intertwined with the legacy of the IRA in contemporary Belfast. Tessa, a BBC producer and new mother, is stunned to see her sister on TV, implicated in an IRA raid. Refusing to believe Marian capable of such acts, Tessa embarks on a tense and dangerous journey to uncover the truth, discovering unsettling secrets about her sister's involvement. As the layers of deception peel away, Tessa confronts a web of moral dilemmas that challenge her family loyalty, her ideals, and her own identity, all while striving to keep her young son out of harm's way. 'Northern Spy' is a bone-chilling narrative that not only delves into the heart of modern political unrest but also probes the profound depths of sisterhood, and the sacrifices mothers will make for their children.