Four homeless art students move into an abandoned house in London where a hidden terror lurks.

The physician tells Molly that she has heartburn and to "lay off the spliffs," she goes to her art class where she is drawing a nude woman.

They meet up with Toby (George Magire) and Zoe (Amy Noble), all packing the van to go searching for a vacant home to squat.

When they arrive at their first destination, they quickly discover the residence is too secured and decide to drive around to find a new place.

As Zoe dances around the room with a hat from the wardrobe, Molly and Luke quickly recognize there is blood on the clothes.

They begin yelling for help when they see a patrol officer in front of the house looking at their parked van.

A door in the room quickly slams shut and a gas begins to seep through the threshold and knocks all four of them out.

The films cuts to Toby sitting in one of the four chairs in the dank room and a rubber gloved hand covers his mouth.

The film cuts back to Toby as he is now tied to a metal cot and he is thrashing in attempts to break free.

A man in a hazmat type suit and a surgical mask quickly enters the room and gives him a sedative that knocks him out.

The film cuts back to Molly and Luke as they find a key in the wall to the fuse box.

Luke is hiding behind a door when he sees the hazmat suited man walk past slowly.

As the man comes down the stairs, he falls through the sabotaged steps, Molly grabs a wooden object and hits him in the head, knocking him out.

She sees a few newspaper articles about how a father was beaten in front of his son, and a few identification cards showing the old man was or is a surgeon.

The old man is standing in front of an urn (we assume it is his father's ashes) when he hears the jingle of the keys Molly is using to try to get free.

The sound returns as Molly is locked in the room with the only light is a TV that is knocked down and showing only static.

It is the girl from the missing persons broadcast from the beginning of the movie (while Molly was in the emergency room), but she is clearly exhibiting animal instincts.