If you've seen "Friday 13th" or anything similar, you've seen this film, ie a physically formidable individual who materialises out of thin air to murder people indiscriminately. Such films generally lack all but the most rudimentary of plots, ie ie a physically formidable individual who materialises out of thin air to murder people indiscriminately.
This one does have a plot of sorts, the previously unsolved murder of a man in gruesome circumstances and the disappearance of his better half, who is presumed murdered. A dude turns up a year or so after the murder to investigate, and he has a strange tale to tell, namely he came face to face with the killer in gruesome circumstances when he was a young boy. The one person he tells doesn't believe him, until she discovers Google.
Suddenly, there are more murders, many of them, and a showdown. That's as good as it gets. Good?