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The Kapa family, consisting of parents Guy and Prisca, along with their children Maddox and Trent, check into an upscale resort. They anticipate a memorable getaway, unaware of the trials that lie ahead as they settle into their luxurious accommodations.

While enjoying their vacation, Trent befriends a boy named Idlib. Their playful interactions involve interviewing other guests about their names and jobs, establishing a bond amidst the tension brewing between their parents.

During breakfast, chaos erupts when a nearby guest, Patricia, suffers an epileptic seizure. Charles, a doctor at the resort, along with his wife Chrystal, rushes to provide assistance, momentarily disrupting the leisure of the morning.

The Kapa family joins Charles and his group for a trip to a secluded beach. Initially, it seems like a day of fun as children play and adults relax, but the atmosphere shifts dramatically with a shocking discovery.

While enjoying their time at the beach, the group is unsettled by the discovery of a lifeless body belonging to Brendan's companion. This harrowing event ignites suspicion and panic among the adults, leading to accusations targeted at Brendan.

As the day unfolds, the children begin experiencing strange phenomena, including rapid aging. Meanwhile, Brendan reveals his medical conditions, setting the stage for even more unsettling developments on the beach.

As chaos ensues, Prisca's medical condition worsens, leading to an emergency surgery. The urgency of her situation is underscored by the grotesque nature of her growing tumor, which becomes a focal point of fear for the family.

Amidst the turmoil, Kara inexplicably becomes pregnant, bringing new anxiety to the group. The situation culminates in tragedy as she endures the traumatic loss of a stillborn child, intensifying the emotional strife faced by those on the beach.

As panic escalates, Charles, fueled by suspicion and fear, loses his grasp on sanity. He violently confronts Brendan, leading to tragic consequences that further fracture the group's dwindling unity.

Amid the chaos and uncertainty, several adults meet their tragic fates, leaving the children to grapple with loss and grief. These harrowing moments bring forth deep-rooted family issues as the Kapa family confronts their reality.

As night falls, the Kapa couple confesses their enduring love for one another, showcasing a poignant moment before they succumb to the effects of the accelerated aging. Their children are left to mourn their untimely passing.

Come dawn, as the siblings navigate their precarious situation, they stumble upon a coded message that links them to a potential escape route. This discovery fuels their determination to uncover the truth about their entrapment.

In their search for escape, Maddox and Trent uncover a coral reef which seems to offer a way out from their surreal prison. However, their hopes are dashed when the perils of the reef make it challenging to navigate.

As the siblings uncover disturbing truths about the resort's purpose, it is revealed to be a front for conducting medical experiments. Their findings compel them to act, ultimately leading to the arrest of the resort staff.

In the climax, as authorities are summoned, Maddox and Trent take flight in a helicopter, leaving the haunting memories of the past behind them. Their newfound freedom is overshadowed by the chilling legacy of their experiences at the beach.