High school sweethearts Frank Beardsley, a dedicated and widowed Coast Guard Admiral, and Helen White, a talented and also widowed handbag designer, find themselves unexpectedly reunited in a charming twist of fate. When Frank and his children move back to his hometown of New London, sparks ignite once more between the couple during a chance encounter at a local restaurant while they are both out on separate dates. The magic does not stop there, as their paths converge again during their 30-year class reunion—a moment that rekindles the passionate connection they once shared.

Without delay, they decide to marry in a private ceremony, fully aware that their new union will entail a significant family blended challenge. Frank comes with eight children from his first marriage, while Helen brings ten children into the fold—a blend of biological offspring and adopted children from her previous life experiences. They settle into a new home conveniently located on the same land as the lighthouse where their love story began with a breathtaking first kiss. The household rapidly fills with not only the children but numerous pets belonging to the North family, and the comforting presence of Frank’s diligent housekeeper, Mrs. Munion.

As their new lives unfold, it becomes remarkably clear that Frank’s military background instills in him a strict and regimented way of living, in strong contrast to Helen’s more artistic and relaxed demeanor as a professional designer. The contrasts between their lifestyles noticeably disrupt the harmony within their newly formed family unit. The children—who have inherited their parents’ defining traits—struggle to adjust to their parents’ whirlwind marriage, resulting in an explosive paint fight during what was meant to be a fun renovation project for the lighthouse.

In an effort to have their voices heard, Frank’s oldest son, William, champions a meeting among the siblings. He suggests that they can tackle their parents’ differences by exposing them in front of one another in a tactical ploy intended to create an environment where their conflicting philosophies come to a head. However, in doing so, they begin to bond more deeply over their shared experiences, from attending soccer matches to supporting William in his quest for class president.

As time passes, Frank and Helen find themselves attending an official Coast Guard dinner where Frank is offered a prestigious opportunity to succeed the Commandant. However, in a heartfelt nod to his responsibilities both to the Academy and to his newfound family, Frank declines this high-ranking position. Meanwhile, the older children decide to throw a grand party, which spirals wildly out of control. When Frank and Helen return to find their once peaceful home in utter chaos, a confrontation brews between them; Frank’s anger clashes with Helen’s more relaxed approach, peaking in what turns out to be their most intense argument yet.

Gradually, their children begin to recognize that their initial plot to manipulate their parents may have backfired, as it becomes apparent just how happy Frank and Helen had been together. Realizing their role in the turmoil, the kids embark on a mission to mend the rift they inadvertently created. They rally together with the help of Helen to set things right.

Their mission soon transforms into a race against time to locate Frank, who feels uncertain about Helen’s commitment to him. In a perfect moment of communication, Helen activates the lighthouse spotlight, reminiscent of a sweet story that Frank once shared with her, triggering his longing for her love. Ultimately, they find themselves joyfully reunited, solidifying their bond by renewing their vows—not just as a couple, but surrounded by their vibrant family tapestry, now woven tighter than ever.