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

An ill-fated television reporter is rescued and sent on a voyage across the ocean, but she is followed by the deadly virus that has plagued her and numerous others.

In order to ascertain the current situation inside, a supposed medical officer and a GEO team step into the quarantined and ill-fated apartment building.

There's something in this house - Something ancient and dark that remains still, hidden and silent. It can only wait, having been concealed in the shadows for years. In fact, its milieu is darkness.

Follows a genius engineering graduate who is interested in the Bank of Spain's safe.

At her new job in a rundown children's hospital, a nurse desperately tries to keep her patients safe from a plague of random, mysterious attacks.

A teenage girl moves into a remote countryside house with her family, only to discover that their gloomy new home has a horrifying past that threatens to destroy the family.

A television reporter and her cameraman are trapped inside a building quarantined by the CDC, after the outbreak of a mysterious virus which turns humans into bloodthirsty killers.

Samuel Salomon, a literature professor, has been off work for almost a year after the tragic death of his girlfriend. Samuel has been suffering from a recurring nightmare in which a woman is brutally murdered by a strange ritual. Suddenly, the same woman who appears every night in his dreams is found dead in exactly the same circumstances. Samuel sneaks into the crime scene and there he meets Rachel who has also dreamed about the murder. Together, they will do whatever they can to discover the identity of the mystery woman, entering a terrifying world controlled by the figures who have inspired artists throughout time: The Muses.

Apartment concierge Cesar (Luis Tosar) is a miserable person who believes he was born without the ability to be happy. As a result, he decides his mission is to make life hell for everyone around him. A majority of the tenants are easy to agitate, but Clara (Marta Etura) proves to be harder than the most. So Cesar goes to creepy extremes to make this young woman mentally break down. Things get even more complicated in this twisted relationship when her boyfriend, Marcos (Alberto San Juan), shows up.

There's something in this house... Something ancient and dark that remains still, hidden and silent. It can only wait, having been concealed in the shadows for years. In fact, its milieu is darkness. Only in it can it show itself and move. It even takes its name: DARKNESS. It's lived here since someone tried to call it, more than forty years ago. Because this house hides a secret, a terrible past, an inconceivably evil act... Seven children, faceless people, a circle that must be completed. And blood, lots of blood...

As the new night nurse at a soon to be abandoned children's hospital readies the last group of orphans to leave, it becomes increasingly clear that these are not normal children. Something living in the hospital, something the children call the "mechanical girl," has a terrifying hold over them and will stop at nothing to keep them in the hospital with her forever.