As the year 1862 unfolds, a determined widow, Anna Leonowens, arrives in Bangkok, Siam—soon to be recognized as Thailand—accompanied by her young son, Louis. Summoned personally by the King of Siam, Anna embarks on the noble pursuit of educating his many children. Despite the imposing presence of the Kralahome, the King’s loyal prime minister who comes to escort them to the palace, Anna's courageous spirit remains unbroken. However, this arrangement defies her original contract which clearly stated that she and her family were to reside separately.
Weeks pass, and Anna and Louis soon find themselves essentially imprisoned within the palace's lavish confines, their movements curtailed by the rigid protocols of the royal court. Meanwhile, the King receives a stunning gift from his Burmese counterpart—a beautiful slave girl named Tuptim, whose destiny is to join his harem. Proudly accompanied by Lun Tha, a scholar devoted to replicating temple designs, Tuptim enters the palace unaware that their hearts are intertwined, as she laments that despite the King’s ownership, her heart belongs to Lun Tha. > "My Lord and Master."
When Anna finally meets the King, she's amazed to learn of his keen interest in her reputation as a modernizer within Siam. She adeptly maneuvers through the intricacies of royal decorum while addressing his apprehensions about educational reform. Still, when it comes to her living conditions, the King brusquely dismisses her grievances, indicating that she should engage with his wives instead.
Intrigued by her strong demeanor, the King's wives invite Anna to share memories of her late husband, Tom. > "Hello, Young Lovers." These exchanges lead her to meet her new students—numerous children whose mothers enjoy the King's favor. The royal procession, decorated with princes and princesses, marks the official commencement of Anna’s role as their educator.
As formalities fade away, Anna is captivated by the spirited young royals, who eagerly gather around her, their energy shattering the barriers of formality. With unwavering determination, Anna strives to impart essential life lessons, yet she frequently clashes with the King, whose tolerance wears thin with her insistence on the value of home life. His frustrations manifest as he questions why the world seems so bewildering. > "A Puzzlement." Meanwhile, the royal family is found dutifully studying English at the Royal Bangkok Academy, showing their dedication to their newfound educational privileges—a clear indication of Anna's influence.
As the crown prince, Chulalongkorn, contests the chart's validity during their lessons, the King bursts in, only to discover uproar among the students. He orders them to accept Anna's teachings while simultaneously chiding her for stressing "home". Undeterred, Anna stands her ground, threatening to leave Siam if her original terms are not honored—a scenario that disheartens the wives and children. The King commands her to comply as a servant, but Anna defiantly rejects this notion, departing in haste. Amidst the ensuing chaos, Lun Tha finds a moment with Tuptim, where they contemplate the necessity of concealing their blossoming love. > "We Kiss in a Shadow."
In moments of introspection, Anna recalls their fiery confrontation, simmering with rage, > "Shall I Tell You What I Think of You?" Lady Thiang, the King's chief consort, leans in to share intimate details about the monarch's anxieties regarding his public persona, which British influences are eager to frame as primitive. This revelation rattles Anna, as she grapples with the paradox of the King’s multiple wives yet finds it hard to accept these accusations regarding his character. Lady Thiang's insights eventually break through Anna's defenses, leading her to reconcile with the King, who reveals that a British envoy is due to arrive in Bangkok. Upon hearing this, Anna feels the urgency of the situation and "guesses" that the King will greet them in a European style, alongside his wives dressed in Western garments.
As the King prepares for a Buddhist prayer to seek blessings for the upcoming visit, he promises Anna that her own residence will be provided soon, fulfilling their earlier agreement. However, in the flurry of preparations, a critical detail regarding undergarments is overlooked, leaving the royal consorts in a state of disarray when Sir Edward Ramsay, the British envoy, arrives. The whimsical chaos unfolds as they mistakenly flee in fright, only to have the envoy handle the situation diplomatically.
As the evening progresses, Tuptim meets with Lun Tha to discuss their escape plans, unveiling her hopes during a fleeting moment together. Anna inadvertently witnesses their intimate meeting, but their shared bond strengthens during this clandestine moment. Under Tuptim's guidance, the evening culminates in a delightful Siamese ballet that narrates her poignant story of escape and resilience, all while Anna looks on.
After the performance, as Sir Edward informs Anna that the British threat has receded, the King grapples with the potent message conveyed through Tuptim’s tale. Celebrating the successful evening together, Anna receives an emblem of the King’s affection—a ring. Unbeknownst to them, reports of Tuptim’s disappearance ignite concern, leading the King to question Anna, suspecting she knows more than she lets on. The tension escalates when Anna attempts to bridge cultural gaps by explaining the Western dance of courtship, > "Shall We Dance?", which the King eagerly wishes to learn.
This tender moment, however, is cut short by the Kralahome's revelation of Tuptim's capture. The King, determined to assert his power, prepares to administer punishment, yet falters before Anna's unwavering gaze. He leaves hastily, torn between duty and his compassion. As the heartbreaking news of Lun Tha's demise lingers in the air, Tuptim vows that her fate will not mirror his. With the night drawing to a close, Anna relinquishes the ring to the Kralahome while both she and the minister grieve the profound changes her presence has wrought within the palace.
As seasons turn with barely a word exchanged between Anna and the King, she readies to depart, her heart yearning for freedom across the seas. Just as she prepares to board the vessel, a sudden arrival interrupts her plans—Chulalongkorn, with a letter from the King, whose internal conflict has spiraled dangerously. Anna rushes to his side, their reunion serving as a poignant exploration of forgiveness and love.
In his final moments, the King reveals a wisdom fused with melancholy, urging Anna to reclaim the ring and guide his son, Chulalongkorn, as he ascends to the throne. With a heavy heart, Anna agrees as the young prince steps into a series of new responsibilities, issuing commands that abolish the distressing ritual of kowtowing—a tradition Anna long despised.
Though the King’s reluctant acceptance of these reformative decisions showcases his love for his son, it is evident he has surrendered to a fate he could no longer escape. As Chulalongkorn continues to uphold a new standard of respectful governance, the King’s life force dwindles gradually. Finally, when he breathes his last, Anna kneels beside him, her tears cascading like summer rain, offering a final gesture of respect as she holds his hand and kisses it tenderly. The wives and children gather around, their heads bowed not only in remembrance of the late King but also in reverence for the prince who will now carry forth the legacy of their kingdom, embarking on a path filled with uncertainty yet blossoming with hope.
