In 1903 London, after the lackluster reception of his latest play, [J.M. Barrie](johnny-depp) (played by Johnny Depp) encounters the widowed [Sylvia Llewelyn Davies](kate-winslet) (portrayed by Kate Winslet) and her four young sons—George, Jack, Peter, and Michael—in Kensington Gardens. This meeting blossoms into a profound and intimate friendship. Barrie becomes a delightful playmate and a surrogate father figure to the boys, who engage in wild imaginative escapades. From piecing together epic adventures in their backyard to kite flying, their creativity inspires Barrie to craft a play about boys who resist growing up, particularly focusing on the troubled young Peter Llewelyn Davies.
Barrie shows kindness by gifting Peter his very first diary, encouraging him to dive into storytelling from his vivid imagination. Alongside Barrie’s growing bond with this family, he maintains friendships, notably with [Arthur Conan Doyle](ian-hart). Meanwhile, his wife, Mary, extends an invitation to Sylvia and her family for dinner, leading to Barrie missing meals at home. With his desire to lend a helping hand, he suggests loaning their cook to Sylvia, who struggles to manage her household alone.
As Barrie's connection to the Llewelyn Davies family deepens, it raises eyebrows among others. Sylvia, a widow whose husband succumbed to cancer, is trying to raise her four sons alone. [Arthur](ian-hart) advises Barrie to be cautious of how his relationship with Sylvia and her boys can be perceived by outsiders. Regardless, Barrie’s affections lead him to invite Sylvia and her sons to his summer cottage, a setting where the essence of "Peter Pan" begins to emerge.
Meanwhile, the fragility of Barrie's marriage is becoming apparent, as Mary (Radha Mitchell) transitions towards her own future, becoming involved with Gilbert Cannan (Oliver Fox). She eventually insists that Barrie returns home, which catalyzes their divorce. Resentments grow, particularly from Sylvia's mother, [Emma Du Maurier](julie-christie), who disapproves of Barrie's considerable time spent with the family and fears for Sylvia’s increasingly precarious health.
Despite this scrutiny, Barrie's adventures with Sylvia and her sons fill his heart with joy, reminding him of the boy he once was. These experiences inspire him to adapt them into the famed play, "Peter Pan," much to the skepticism of his producer, [Charles Frohman](dustin-hoffman). The show demands extravagant staging, igniting doubt that it could capture the fancy of highbrow theatergoers. Barrie, however, is undeterred, insisting they can replicate the oceans needed for the play.
In an unfortunate turn, George suffers an injury when his brothers let go of the ropes during a flying scene in the theater. He demands his mother to receive medical attention before he'll permit his injury to be treated. As the opening night of "Peter Pan" approaches, Barrie devised a plan to fill the audience with children from a nearby orphanage, their joy amplifying the night’s experience for the solemn adults.
However, when Peter arrives at the play alone, missing his mother's presence due to her illness, Barrie rushes to check on Sylvia, ultimately forfeiting his chance to see the premiere. Realizing the play represents his brothers and Barrie's deep connection to them raises bittersweet feelings within Peter. In the aftermath, Mary comprehends that Barrie's profound connection to Sylvia’s family was essential to his creative endeavor and sincerely apologizes to him.
As Sylvia's health deteriorates further, Barrie enacts a poignant arrangement; he orchestrates an abridged production of the play within Sylvia’s home, creating a beautiful moment where Peter Pan beckons Sylvia to join him in Neverland. Hand in hand with her boys, she transitions into a realm of imagination as the living space morphs into an ethereal paradise.
In a heart-wrenching closing scene, we find ourselves at Sylvia's funeral. Barrie discovers that Sylvia’s last wishes include him caring for her sons alongside Emma, a wistful yet comforting agreement for both. Conclusively, we see Barrie encounter Peter once more on the bench where their unforgettable journey began, sharing an emotional moment that echoes their collective grief and bond, before they gently fade away, leaving only the memory of their friendship behind.
