Dead in 3 days

On the night of their high school graduation, Nina, Martin, Mona, Clemens and Alex each receive an anonymous text warning they will be dead in three days. The message is initially dismissed as a prank, but the ominous threat hangs over their celebration. The friends joke about it while the countdown begins to weigh on them.

Martin is abducted from a dance and later found dead at the bottom of a lake, tied to a weight and dumped into the water. The brutal discovery shocks the group and turns the case toward a killer who knows them. Tension builds as the deadline approaches and fear takes hold.

Patrick, Martin's rival and an outsider to the core group, is questioned as a suspect but released due to lack of evidence. The police struggle to identify the killer among friends, teasing the possibility of a hidden motive. The fear that danger comes from within their circle grows stronger.

Nina is captured by the killer and almost drowned, but Patrick intervenes and saves her. The killer stabs Patrick to death as Nina escapes into the night. The danger intensifies as the killer continues to hunt the remaining friends.

While Nina recovers in the hospital, the killer decapitates Alex by slamming her onto the frayed edge of a fish tank. The grisly attack demonstrates the killer's reach and the deep-seated violence behind the vendetta. The incident raises the stakes for Nina's fight to survive and uncover the truth.

Nina later identifies the attacker as Manfred Haas, Fabian Haas's father, linking the present killings to a childhood tragedy. The revelation intensifies the mystery and suggests a motive of revenge tied to the past. The group learns that the killer's identity is rooted in a long-buried family history.

Police inform Nina that Manfred hanged himself two years after Fabian's death, and that his wife moved away, though she still owns a nearby house. The update reframes the case as a family feud rather than a random series of attacks. The tension shifts as Nina contemplates the possibility of a lurking threat in familiar surroundings.

Nina, Mona, and Clemens sneak onto the Haas property to search for clues, followed by Kerstin, Nina's sister. The killer binds and gags Kerstin, and Mrs. Haas is revealed wearing a mask fashioned from her dead husband's preserved face. The unmasking confirms a chilling, personal vendetta rooted in the past tragedy.

Mrs. Haas fatally stabs Clemens, knocks Nina out, and chases Mona, who falls onto a spiked fence. Mona survives the fall and goes for help, while Nina remains in grave danger. The hunt culminates in a brutal confrontation that exposes the killer's identity.

Mrs. Haas rows with Nina out toward the middle of the lake, intending to drown them both. Nina stabs Mrs. Haas and knocks her overboard, but they both fall into the water and are pulled under. Divers later resuscitate Nina and bring her to the same hospital where Mona is recovering.

At the hospital, Nina flashes back to the moment she and friends taunted Fabian into skating onto thin ice, watching him fall through as they ran away. The memory ties the present violence to their childhood actions and haunts her as she fights to recover.

Divers save Nina and she is hospitalized, with Mona also recovering nearby as the survivors try to move forward. The film closes with Nina contemplating the consequences of their past actions and the fragile line between friendship and danger. The ending leaves a lingering sense of consequences for their choices near the ice that started it all.