Koldo and Clara are about to celebrate their wedding day. The wedding is filmed by Koldo's cousin, Adrián, and their wedding photographer, Atun, plus footage cuts from other guests' mobile phones and cameras. The guests travel to the wedding reception, held in a huge mansion, on chartered coaches. Adrián films his uncle, who says he was bitten by a dog, but says he will be all right.
With the party in full swing, Adrián's uncle begins showing unusual symptoms such as vomiting. Adrián also captures people outside in hazmat suits, searching the area and a police car arriving. Adrián's uncle falls in full view of everyone. His wife approaches to help but he bites her neck, then vomits blood on another guest. More guests infected with the demonic virus burst onto the dance floor and begin attacking people. Amidst the chaos, Koldo and Clara are separated from each other. Koldo ends up with Adrián, Clara's sister Tita, Atun, and a guest named Mencu, who is nicknamed Royalties. Koldo asks Atun why is he still filming and destroys the camera. From then on, the film returns to a normal third-person cinematic view. The group tries the back exits but encounter more infected guests. CCTV footage shows the infected now roaming in the ballroom.
They discover they fit through the air-conditioning vents, apart from Atun due to his size, and head outside. Koldo is attacked by Paloma, the woman the Uncle vomited on. Adrián and the others help him kill her. Royalties tries to use the police car's radio to get help but is attacked. The sirens are set off, attracting the infected towards them. Adrián, Koldo, and Tita find refuge inside a chapel where other survivors have gathered. The survivors reveal infected cannot enter the chapel and that holy water hurts them. Clara's voice comes over the P.A. system and, knowing Koldo is listening, tells him she is all right and reveals she is pregnant, something she wanted to tell him earlier. Encouraged, Koldo suits up with a knight's armor to find her with the help of an employee, telling the other survivors to get the children to the charter coaches and escape.
In the mansion, Clara and the priest from the wedding ceremony are hiding in the control room. A horde of infected people begins trying to break into the room. The priest claims "it's too soon"; he refers to "Genesis" and talks about the nature of the demons reciting from the book of Jude. They escape through a window. Clara finds best man Rafa and Natalie, Clara's friend; they soon encounter more infected. In the mirror, the infected are shown as reflections of Tristana Medeiros. The priest holds them off by freezing them with prayer while the others escape. Koldo searches with the employee for the control room, but the man is then killed by the infected. Koldo then finds the control room and witnesses the deaths of Adrián and the survivors from the chapel as they are attacked by the infected during an attempt to escape by coach. In the background on the TV, a news report regarding the quarantine of an apartment block in central Barcelona is shown, revealing that the events of this film are happening concurrently with the events of the first and second film.
Clara, Rafa, and Natalie find "Sponge John", the children's entertainer, and they try to escape, but Natalie is attacked. Outside, Clara faces her infected mother. John shoots her, but later gets bitten as Rafa and Clara go underground into a tunnel. Clara refuses to leave without Koldo. Inside, Koldo turns up the volume on one of the songs on the dance floor, the song from the start of the film. Clara goes to find Koldo, as she sees this as a sign. She fights off a horde of infected, but Rafa is bitten. Clara decapitates him and flees from the infected. She and Koldo find their way back to each other at last. Their reunion is short-lived as a swarm of infected crash into the kitchen. When they began to think they will die, all of a sudden the infected all freeze as the priest recites Bible verses over the P.A. system.
As they go outside, they are attacked by Koldo's infected grandfather who, being deaf, cannot hear the priest. Clara is bitten and tells Koldo to cut her arm off before the infection consumes her. Koldo does so and they leave. However, when they reach the exit, they discover everything has been quarantined. Clara then vomits blood, showing that she is infected. Devastated, Koldo takes her outside where the police and a GEO team tell him to let her go. Clara and Koldo share a final kiss before Clara bites his tongue off and attacks the armed men, who shoot both of them down. In their final moments, Clara and Koldo hold each other's hands as they die of their wounds. Here is Filming: The film began with the shooting on 4 April 2011 and ended on 20 May 2011. Post-production began on 23 May 2011. The shooting lasted for seven weeks in Barcelona. A teaser trailer premiered in September, while a theatrical trailer was released in December. Rated:R18+ Review of This Film Final Rated:1/10