Set against the backdrop of one of the most pivotal moments in American history, the film chronicles the chaotic events that follow the assassination of President John F. Kennedy in 1963. The narrative unfolds through the perspectives of various individuals drawn into the vortex of the tragedy: a young emergency room doctor at Parkland Hospital in Dallas, the businessman who accidentally captures the assassination on his camera, and the beleaguered head of the local Secret Service office grappling with his failure to prevent the assassination. Each character faces their own emotional turmoil and moral dilemmas as the nation around them plunges into shock and grief.

In a gripping portrayal of real-life events, the first half meticulously details the frantic efforts to save the President's life at Parkland Hospital, juxtaposed against the subsequent fallout and investigation. The film interweaves the personal and professional struggles of those directly involved, shedding light on their heroic and human responses to unprecedented circumstances. Through deft storytelling and intense scenes, it offers a poignant glimpse into a fractured nation coming to terms with an unthinkable loss, setting the stage for an in-depth exploration of the immediate and far-reaching consequences of that fateful day.