What is the name of the thriller flick that was out in the late 1980's on VHS where a group of troubled young people went on a hiking,camping etc.. trip in Washington and the guide's ("EDGAR")mother was an escapee from a mental institution and was killing people in the woods.The "mother lived in an old cabin in the woods where her son was keeping her supplied with canned foods to survive.Ihave been trying to find out at least the name of this.PLEASE HELP