Spain, 1949. Narcisa, a novice, arrives at an old convent, converted into a girls' school, to work as a teacher.

In 1991 Madrid, after holding a séance at school, a teen girl minding her younger siblings at home suspects an evil force has entered their apartment.

A pair of newlyweds must fight to survive when their wedding reception descends into chaos and carnage when their guests become infected by a virus that turns them into hungry zombies.

The action continues from [REC], with the medical officer and a SWAT team outfitted with video cameras are sent into the sealed off apartment to control the situation.

A television reporter and cameraman follow emergency workers into a dark apartment building and are quickly locked inside with something terrifying.