"Hotel Sinestra" is set in the year 2022 and revolves around a spirited young girl named Ava and her older brother, Max. The story begins as Ava expresses her yearning for their parents, who often prioritize their work over spending quality time with their children, to go away for winter break. Much to their surprise, the next morning, not only are their parents absent, but all the adults in the town have mysteriously vanished.
Excited by the newfound freedom and absence of rules, Ava and Max, along with their group of friends, decide to make the most of their situation. They begin exploring their neighborhood, indulging in activities they were usually prohibited from doing, and transforming their lives into an endless playground. The kids have wild adventures, staying up late, eating whatever they want, and causing mischief without any consequences. The once quiet and orderly town evolves into a chaotic and joyous place as children embrace their newfound freedom.
However, as the days pass, the kids realize that having no adults comes with its own set of challenges. Essential services begin to falter, stores forego restocking, and the absence of adult supervision soon leads to accidents and dangerous situations. The initial bliss turns into chaos, and the kids gradually recognize the importance of their parents' presence, guidance, and responsibility.
It is during this critical realization that Ava takes the lead and urges her friends to find a way to bring back the adults. They embark on a quest to uncover the mystery behind the adults' disappearance and explore the titular Hotel Sinestra, a rumored haunted place with a convoluted history. Inside the hotel, they encounter peculiar and perhaps supernatural phenomena, forcing them to confront their fears and uncover an ancient curse that is responsible for the vanishings.
As the kids delve deeper into their investigation, they encounter a mysterious guardian spirit who reveals that the curse was unleashed by a dark force seeking revenge against the town. To break the curse and bring back their parents, Ava and her friends must collect hidden artifacts scattered throughout the town that hold the power to reverse the curse. They face various challenges, navigate dangerous locations, and eventually find the artifacts, each associated with a wise lesson about family, responsibility, and appreciating parental love.
In a climactic conclusion, the kids manage to successfully break the curse and restore their parents. After enduring the chaos and realizing the importance of family, Ava and her friends develop a newfound appreciation for their parents, recognizing that while they may have flaws, their love and presence are irreplaceable. The film concludes with Ava reconciling with her parents, and the town coming together to celebrate the return of the adults, having learned a valuable lesson about the cherished bonds of family and the significance of responsibility and guidance.
