The Shocking Truth: What Did Jeremiah's Letter Say In TSITP? (The Major Wedding Twist Explained)

The question of "What did Jeremiah's letter say?" is one of the most highly anticipated and emotionally charged plot points from the third book of The Summer I Turned Pretty series, which is set to be adapted in the upcoming Season 3. As of today, December 17, 2025, the dramatic reveal centers not on a letter written *by* Jeremiah Fisher, but on a deeply personal message written *to* him by his late mother, Susannah Fisher—a message that contained a shocking mistake with devastating consequences for the Fisher brothers and Belly Conklin.

This pivotal moment, which occurs during the high-stakes drama of Belly and Jeremiah's wedding, is the ultimate emotional catalyst that forces the love triangle to its breaking point. The letter's contents, intended for another recipient, expose the raw truth about Susannah's hopes for her sons and the person Belly was truly meant to be with, changing the course of the story forever. It’s a classic Jenny Han twist that fans of the show and the book, We'll Always Have Summer, have been discussing for years.

The Letter's Origin: Susannah’s Final Wishes for Her Sons

The entire drama surrounding the letter stems from Susannah Fisher’s (Beck) foresight and her deep love for her children and Belly. Before her passing from cancer, Susannah wrote individual, sealed letters to her two sons, Conrad Fisher and Jeremiah Fisher, and to Belly Conklin, intended to be opened on their respective wedding days. This act was a final, loving gesture from the matriarch of Cousins Beach.

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The letters were a way for Susannah to be present for these major life milestones, offering her love, wisdom, and blessing. However, a crucial mix-up occurred, which became the emotional bomb dropped right before Belly and Jeremiah were set to marry.

• The Writer: Susannah Fisher (Beck).
• The Recipients: Conrad Fisher, Jeremiah Fisher, and Belly Conklin.
• The Context: To be opened on their wedding days.
• The Twist: The letter in the envelope addressed to Jeremiah was actually the one intended for his older brother, Conrad.

The Devastating Mix-Up: What Jeremiah Actually Read

The moment of the reveal takes place in the third book, We'll Always Have Summer, during the intense conflict leading up to Belly and Jeremiah’s wedding. After Conrad confesses his enduring love to Belly, a fight erupts between the Fisher brothers. To try and ground Jeremiah, Conrad gives him the letter from their mother that was meant for him.

When Jeremiah opens the envelope clearly labeled with his name, the letter inside is addressed to his brother. This is the content that Jeremiah mistakenly reads, which is a message from Susannah to Conrad on his wedding day:

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“Dear Conrad, I can hardly believe my little bug is getting married today! I am just bursting at the thought that my beautiful boy has found the person he wants…”

Another key line from the letter that has been referenced by the author, Jenny Han, highlights the core sentiment:

“As a mother, there is no greater gift than to see her child be so dearly loved by another person.”

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The letter is a beautiful, loving testament from a mother to her son, celebrating his happiness and his choice of partner. But for Jeremiah, reading this message—knowing it was meant for Conrad, especially after Conrad's Cabo confession to Belly—was a crushing blow.

The Emotional Impact: Why the Wrong Letter Changed Everything

The letter mix-up is not just a simple mistake; it’s a powerful literary device that serves as the final, undeniable proof of the deep, enduring connection between Belly and Conrad. The dramatic irony of Jeremiah reading a letter celebrating Conrad's future with the person he loves (implied to be Belly) is a heavy weight for the younger Fisher brother.

The revelation hits Jeremiah hard, making him realize that even his late mother had, perhaps subconsciously or in a moment of clarity, recognized the profound bond between Conrad and Belly Conklin. This realization is a major factor in the subsequent events that lead to the cancellation of the wedding and the eventual resolution of the central love triangle.

Key Entities and Plot Points Affected by the Letter:

• Jeremiah's Realization: He understands the depth of the connection between Conrad and Belly, and perhaps even Susannah's implicit approval of their pairing. This realization contributes to his decision to call off the wedding.
• The Love Triangle: The letter directly accelerates the resolution of the Conrad, Belly, and Jeremiah dynamic, forcing all three characters to confront the reality of their feelings and the future of their relationships.
• Conrad's Role: Conrad, who initially gives the letter to Jeremiah, is deeply affected by the fallout. He is forced to confront his own feelings and the pain he has caused his brother.
• Belly's Choice: The emotional turmoil surrounding the letter helps Belly realize that she cannot marry Jeremiah to "erase" Conrad, as she was attempting to do.

What Did Susannah’s Letter to Jeremiah Actually Say?

While the focus of the dramatic plot twist is overwhelmingly on the letter meant for Conrad, fans have long speculated about the contents of the letter Susannah actually intended for Jeremiah. While the book does not explicitly quote the letter in the same detail, the general sentiment is understood.

The letter intended for Jeremiah would have been a heartfelt message of maternal love, celebrating his happiness and the person he chose to spend his life with. Some fan interpretations and book discussions suggest that Susannah may have expressed regret for not fully seeing Jeremiah's potential with Belly earlier, or simply offered a loving blessing tailored to his unique, sunny personality.

Regardless of the exact words, the letter was meant to be a moment of pure, unadulterated joy. The fact that Jeremiah read the wrong letter, a letter that pointed him toward his brother's destiny, makes the moment one of the most heartbreaking and pivotal in The Summer I Turned Pretty saga, cementing its place as the definitive turning point in the Fisher brothers' relationship with Belly.

As fans eagerly await the release of Season 3, which will adapt the events of We'll Always Have Summer, the dramatic reveal of Susannah’s letter mix-up is poised to be one of the most talked-about and emotionally intense scenes of the entire series.