In the scorching summer of 1956, Jean Rice, a disillusioned art teacher from London, sets off to visit her family's seaside resort. Her emotional turmoil is palpable, particularly after ending her engagement with Graham, who eagerly urges her to join him in Africa. Compounding her distress is the looming Suez Crisis and the recent departure of her soldier brother, Mick, which resonates deeply with her as she recalls the large anti-war protest at Trafalgar Square condemning Prime Minister Anthony Eden's policies.
Upon reaching the now-faded resort town, which once flourished, Jean is confronted with its diminished allure. Her father's music-hall act, Archie Rice (Laurence Olivier), struggles to engage a dwindling audience, reflecting his own defeatist outlook. The family dynamics reveal a tapestry of dysfunction: Phoebe, Archie's second wife, openly ridicules his notorious womanizing; their son Frank remains cynical and aloof; and Jean's treasured grandfather, Billy, once a star of the music hall, now enjoys a quiet retirement away from the spotlight.
As Jean witnesses her father's performances at the local theatre, the depth of his desperation becomes evident. Facing bankruptcy and battling the bottle, Archie's interactions with his family are strained, filled with a blend of exasperation and pity. Frank oscillates between fondness and frustration for his father, while Phoebe watches with an air of detached cynicism. Despite these obstacles, Archie retains his charm as a performer, capable of captivating any audience when on stage.
As Archie's latest show winds down, he is increasingly preoccupied with securing a new winter engagement. During his stint as master of ceremonies at the Miss Great Britain beauty contest, he finds himself captivated by the runner-up, Tina Lapford. This leads to a secret affair, with her affluent and ambitious parents offering Archie a tantalizing proposition: if he casts Tina in his next show, they will underwrite its production costs. Seizing this opportunity, Archie embarks on a mission to reinvigorate his floundering career, blissfully unaware of the upheaval about to erupt.
As reports of Mick's capture in Suez reach the airwaves, tension grips the town with stories of a fierce and tragic conflict. Yet, Archie remains unsettlingly detached, focusing solely on his upcoming venture and his clandestine romance. Meanwhile, Jean uncovers the truth about her father’s affair and confides in her grandfather, Billy. Out of misplaced loyalty, Billy confronts Tina’s parents, divulging Archie's already complicated situation: his marriage and financial woes. This revelation leads to a rupture in ties with the Lapfords as they hastily back away from Archie.
The community is shaken when news of Mick’s death spreads, coupled with the announcement of his posthumous Victoria Cross. Despite the sorrow enveloping those around him, Archie remains in his oblivious bubble, fixated on self-interest. When his brother-in-law suggests relocating to Canada to start anew, Archie dismisses the idea, instead orchestrating a new show featuring Billy, who still enjoys immense popularity with the public.
However, tragedy strikes on opening night when Billy suffers a fatal collapse just prior to going on stage, further unraveling the already fragile family ties. By this point, Phoebe and Frank are resolute in their plans to begin fresh in Canada, while Archie stubbornly opts to remain behind, facing potential incarceration. As the tragedy culminates, Archie delivers what may be his ultimate performance to an audience that seems disinterested, all while his world spirals into chaos around him.
