Frankie McGuire, known as one of IRA's deadliest assassins, unwittingly entangles an American family in the web of terrorism. Sent to the US to procure weapons, Frankie finds himself living with Tom O'Meara, a New York police officer who is oblivious to Frankie's true identity. Their unlikely friendship and Tom's growing suspicions force Frankie to make a choice between his promise of peace or a lifetime of bloodshed. As tensions rise and loyalties are tested, Frankie must navigate the treacherous waters of deceit and betrayal to find his own redemption.