This was a good movie (SPOILER ALERT)

Kinda reminded me of one of those MOVIE OF THE WEEK'S on network television back in the 1970's. I liked it cause there wasn't excessive gore but it was like the title said a NAILBITER. I also liked the use of the cell phone. A little differint than it just not working like in most horror movies. In additionm,I was thinking that maybe the whole family would have survived and was surprised when they started getting knocked off...