A group of college students boards a party train to celebrate New Year's Eve, an event eagerly anticipated as a major festivity with friends in elaborate costumes. Among them is Alana, who is unaware that the joyous occasion will turn into a night of terror. Three years earlier, they had played a cruel prank on a fellow student, which ended in disaster. As the train departs, the joyous atmosphere begins to shift as one by one, students fall prey to a masked killer who seems to be connected to that fateful prank. The killer’s disguises and the partygoers' costumes create a chaotic and claustrophobic atmosphere, making it difficult for anyone to distinguish friend from foe.

Panic ensues as the survivors realize they are trapped on the moving train with a murderer among them. Suspense builds with every twist and turn, heightened by the train's confined setting and the escalating body count. Alana must confront her past as she grapples with the terror unfolding before her eyes, leading to a relentless fight for survival through the narrow corridors and compartments of the train. Will they uncover the killer’s identity before it’s too late? The night spirals into a desperate game of cat and mouse, where the only way out is through uncovering old secrets buried beneath their seemingly carefree revelry.