Sabrina Watson, the cherished sole heir of the affluent Watson family, has been raised in the idyllic surroundings of Martha's Vineyard, alongside her nurturing mother Claudine and her supportive father Greg. The story kicks off when Sabrina unexpectedly overhears a deceptive conversation involving Bobby and his mistress. Disturbed, she turns to divine guidance, making a vow to uphold her chastity until she ties the knot. However, an unforeseen twist awaits her when she accidentally collides with Jason Taylor while driving. His gracious acceptance of her concern blossoms into an invitation for dinner, sparking a five-month romantic relationship. During this time, Sabrina opens up to Jason about her job offer in China and broaches the idea of a long-distance romance, which Jason ultimately declines, leading to Sabrina’s heartbreak. Just when it seems all is lost, Jason surprises her during a music group performance by proposing, a gesture that Sabrina eagerly accepts.
As preparations for the wedding begin, Sabrina's mother grows increasingly worried about the upcoming union but decides to trust her daughter's judgment. With guidance from Reverend James, they plan for a driver to bring Jason's family and friends to the wedding. This eclectic entourage includes Jason's insecure mother Pam, his charming uncle Willie Earl, Pam's close friend Shonda, and his cousin Malcolm, along with Sabrina's aunt Geneva. The first meeting between the two families is fraught with tension, as disapproval lingers in the air, each party exchanging barbed remarks. Pam quickly takes offense at Sabrina's generosity, marking her with three strikes already. During a cocktail party, Sabrina confides in her maid of honor Blythe about the growing anxiety surrounding the wedding. While Blythe steps away to fetch some wine, she unexpectedly encounters Chef McKenna, igniting an immediate spark between them. Simultaneously, Shonda finds herself drawn to Sebastian, one of Sabrina's cousins, though their age gap leaves her feeling uneasy.
As dinner unfolds, Pam's biting blessing leads to a tense confrontation with Claudine, only to be diffused when Greg intervenes. But the drama intensifies when Claudine hints at a possible affair involving Greg and his colleague Amanda. Pam's eavesdropping reveals a shocking secret: Geneva is actually Sabrina's biological mother, who had placed her for adoption.
As the bachelor party hits its peak, complications arise in Sabrina and Jason's relationship due to his mother's pressure for them to uphold the cultural tradition of "jumping the broom." A heated argument ensues, compounded by Malcolm's feelings of insignificance as Jason's best man. Feeling overlooked, Malcolm confides in Jason about his true motive for attending the party—seeking financial help. As Jason leaves to apologize to Sabrina, chaos erupts in the kitchen when Chef McKenna becomes distracted by Blythe's flirtations, leading to a culinary disaster that triggers the fire alarm. While Sabrina initially responds to Jason's sorry with a slam of the door, they resolve their differences over text, though lingering doubts about their wedding persist.
After the bachelor party, a sense of normalcy returns as everyone plays football and engages in lighthearted banter, yet beneath the surface, secrets loom. Pam endeavors to tell Jason about Claudine and Geneva’s mysterious history. At the same time, Chef McKenna expresses his feelings for Blythe, signaling a budding attraction. Meanwhile, the reality of Greg’s financial woes, stemming from dubious investments, weighs heavily as Pam seeks to confront Sabrina about her secrets—only to be interrupted by an injury Jason sustains during the game.
Sabrina faces a personal upheaval when Claudine and Geneva finally divulge the truth of her parentage, leaving her reeling with confusion. In a flood of tears, she drives away, effectively calling off the wedding as Jason confronts his mother, asserting his need for respect and independence. In a tense moment, he retaliates against Malcolm for a sarcastic comment that diminishes their friendship. Seeking guidance, Jason turns to prayer, longing for divine support amidst the chaos of impending decisions.
As Sabrina stands on the dock, with her boat gently bobbing in the water, she receives a heartfelt call from Geneva. The distant sound of seagulls creates a somber backdrop as Geneva narrates the complicated history of Sabrina's father, a man who had enchanted her mother with tales of love and adventure. Yet, as Sabrina learns about his existing family commitments, she finds herself heartbroken, her dreams shattered.
Jason’s return breathes new life into Sabrina's heart as they work to rediscover their love amidst the challenges. In a moment of vulnerability, she prepares for the wedding but is confronted by Pam’s message, filled with apologies and regrets. Instead of letting their differences fester, Sabrina bravely pursues her mother, pleading for reconciliation. Ultimately, their love prevails, and they embark on a shared path toward healing.
As the wedding festivities commence, Sebastian finally wins Shonda’s affection in a sweet kiss, signaling a fresh start for them both. Elsewhere, Greg and Claudine rekindle their romance, with a revelation about hidden funds paving the way for their financial recovery. Romance blooms for Malcolm and Amy, the wedding planner, culminating in an unexpected dance invitation. The night culminates in a joyful family gathering as they perform the Cupid Shuffle, their love and solidarity palpable under the starlit sky.
