TCM showed this a week ago and I taped it. Very nice ghost story, as you say, with an effective cameo by John Houseman (took me a minute or two to figure out that it was really him). Some bad decisions were made, as is customary in this genre - personally, if a scary fog surrounded my house and a mysterious figure started pounding ominously on the door, I would not open it and wander out onto the porch. Just saying. I did wonder if Carpenter saw DeMille's The Ten Commandments and the deadly mist that trails through the streets.
There are a lot of plot points, insofar that there is a plot, and happenings with no follow up or explanation. This may bug you or it may not (it didn't bother me, but I would find it understandable it it bothered others). The actors are engaging and the Point Reyes locations are gorgeous. I will say that the ending is not as scary or boffo as it might be, and the timing is a bit off - the buildup seems to go on for too long, and then the movie ends too abruptly. Still very enjoyable.