This appears to be a re-release of the 2010 film called "13 hours."
Sarah (Isabella Calthorpe), who has been away from home for a long time, returns to England from LA. The house is being remodeled. We are introduced to Duncan (Simon MacCorkindale), Sarah's stepfather. There are some bill issues and mom is away for...? but will return in a couple of days. She is accused of keeping a boyfriend and draining the family of money. Sarah joins her brother out in the garage/barn where we are introduced to the rest of the gang. She has 3 brothers: Steven (Peter Gadiot),Charlie (Gabriel Thomson), and Luke (Antony De Liseo). Doug (Joshua Bowman) is a playboy and a friend of the guys. Emily (Gemma Atkinson) is Steven's girlfriend, formerly Doug's girlfriend as so crudely pointed out by Gary (Tom Felton)another party animal.
After we get the basic idea of who all these people are, under a full moon and a power outage, the drunk stoned party moves to the big house with flashlights and candles....only to discover the terror that occupies the house. (If you have read the title or looked at the cover, you got a good idea what is there.)
The creature makes noises that sound like "Predator" apparently an easy noise to duplicate as all the horror films have gone to it. The "night wolf" moves through the house by jerking around an infra-red camera. The movie was a fairly good idea that was poorly executed and suffered from the lack of decent special effects. I thought the support cast of Tom Felton and Gemma Atkinson were great. Isabella Calthorpe left much to be desired.
F-bombs, sex talk, no real nudity. Pot smoking, drinking.