In 2007, we find John Tyree (Channing Tatum), a Staff Sergeant serving in the United States Army Special Forces, lying on the ground clad in combat gear, riddled with multiple gunshot wounds. As coins cascade around him, he reflects in a voiceover on a childhood trip to the U.S. Mint, drawing a poignant parallel between himself and a coin in the military, declaring that the last thought to cross his mind before he loses consciousness was "you."
Moving back to 2001, in Wilmington, North Carolina, John is enjoying a vacation when destiny strikes. He encounters Savannah (Amanda Seyfried), a college student on spring break, while rescuing her purse from the water. Over the course of two enchanting weeks, a passionate romance blossoms between them. John also meets Savannah’s family, including her neighbor, Tim Wheddon (portrayed by Henry Thomas), and his son Alan (Luke Benward), who has autism.
Savannah soon finds herself in the company of John's father, Mr. Tyree (Richard Jenkins), a reclusive man consumed by his obsession with his remarkable coin collection, particularly mules. Surprisingly, Savannah is drawn to Mr. Tyree’s genuine interest. She raises a sensitive topic when she suggests that John’s father might, like Alan, have high-functioning autism. Upset by the implication, John storms off, leading to a confrontation with Savannah's friend Randy (Scott Porter), during which he inadvertently hurts Tim. Filled with remorse, John apologizes to Tim, leaving a heartfelt note for Savannah before they share a bittersweet day together, parting ways with the promise of "I'll see you soon, then," rather than a mere goodbye.
Their relationship evolves through letters, filled with hope as they plan for their future once John leaves the army. However, the devastating September 11 attacks prompt John to reconsider his commitment, ultimately leading him to re-enlist. Over the following two years, their romance persists through their written correspondence. Just when John eagerly anticipates another letter, he instead receives a heart-wrenching Dear John letter, revealing Savannah's engagement to someone else. In a moment of despair, he burns all her letters, trying to soothe his wounded heart.
Even after suffering injuries and receiving encouragement to return home, John chooses to re-enlist, serving for an additional four years filled with numerous missions. He later learns of his father’s serious health condition after suffering a stroke. Rushing to the hospital, John finds his father alive yet gravely ill. In a deeply emotional moment, he reads a letter to his father—this letter contains John's poignant thoughts that were echoed in the film's opening: he shared that both coins and his father were the foremost thoughts during his crisis. Tragically, his father passes soon after.
Returning to Savannah, John is stunned to discover she is now married to Tim and living with him. He learns that Savannah had to shelve her aspiration for a riding camp dedicated to children with autism, due to Tim’s battle with lymphoma. Together, they visit Tim in the hospital, where he reveals to John that Savannah still harbors feelings for him and has never forgotten their love. That evening, during dinner, John confronts Savannah about her silence, and her reply reflects their cherished bond. As he approaches the door, Savannah’s familiar words, “I’ll see you soon then," linger, but in a moment of heart-wrenching finality, John replies, “Goodbye, Savannah,” as he walks away.
In a selfless act of love, John decides to sell most of his father’s coin collection, holding on to only the mule to support Tim's treatment. Back in the army, John keeps the mule as a good luck charm. He later receives a letter from Savannah informing him of Tim's passing, ending with the haunting words, "I'll see you soon, then." The film advances to show John as a civilian, having left military life behind, where he unexpectedly spots Savannah in a coffee shop. Their eyes meet, leading to a heartwarming final embrace, suggesting that their story may not be over just yet.
