As the sun descended behind the scenic backdrop of River Heights, 16-year-old Nancy Drew (Sophia Lillis), grappling with the recent loss of her mother, tried to adapt to her new life with her father, Carson (Sam Trammell). Meanwhile, Carson's determination to maintain the town's quaint charm clashed with local interests, particularly attracting the ire of Willie Wharton (Jesse C. Boyd), a local thug who resorted to intimidation tactics, aiming threats toward Nancy to influence Carson. As Nancy maneuvered through these unsettling circumstances, her steadfast desire for justice began to illuminate a world of hidden mysteries.
During her time fulfilling a community service requirement, Nancy encountered Flora (Linda Lavin), an elderly woman haunted by inexplicable disturbances within her home. Intrigued by the challenge, Nancy invited Helen (Laura Wiggins), Flora's niece, to join her in spending the night at the seemingly cursed residence. As night fell, the atmosphere grew increasingly eerie; lights flickered and burst, cabinet doors swung open as if animated, and a shadowy figure appeared, warning Nancy to cease her inquiries. The following morning, Nancy concluded that these bizarre events were the result of a calculated plot to frighten them away. Together, she and Helen plunged into an extensive investigation, unveiling a concealed passage leading outside that shed light on the supposed ghostly occurrences.
Their further exploration uncovered the truth: the strange happenings originated from ingeniously set-up props, including a modified fuse box, which controlled the lights, alongside a device that dispensed concentrated nutmeg through the air conditioning system, causing nightmarish hallucinations.
While Carson was off on a business trip, Nancy started feeling the weight of something being wrong. Her worries deepened when her attempts to reach Nate (Jon Briddell), Carson’s friend, went unanswered. When Nate finally contacted her, assuring her of a lack of signal at their campsite, Nancy's instincts remained unsettled, especially remembering Carson's insistence on opting for a hotel instead.
As Nancy's worries escalated, she and her loyal friend Helen decided to investigate his hotel. Their findings were alarming—Carson had never checked out, and his phone was still in his room, almost waiting for him. Reviewing the security footage revealed a chilling truth: Carson had been kidnapped by the malevolent Wharton, whose ulterior motives were about to become startlingly clear. Simultaneously, Nancy's friends Bess (Mackenzie Graham) and George (Zoe Renee) uncovered a critical link: Wharton was the same person who had purchased the nutmeg involved in the strange activities at Flora's home. With this vital information, Nancy began to piece together a larger scheme, discovering that Carson was being held captive in a secret passage beneath her very home. It became evident that Wharton and Nate were manipulating events to thwart efforts against the train line's construction and to pressure Flora into selling her property.
As Nancy's relentless pursuit of the truth shattered the illusion of a haunted house, Wharton and Nate found themselves resorting to desperate tactics. Undeterred, Nancy and Helen joined forces to rescue Carson and Flora, culminating in the apprehension of Wharton and Nate.
The following day, as tranquility returned to their lives, Nancy, George, and Bess welcomed Helen into their circle, now a cherished part of their group. United by their unwavering commitment to uncovering truth and delivering justice, they began to strategize for their next adventure at the historic Lilac Inn, eager to embrace whatever mysteries awaited them on the horizon.
