This weak rip-off of Ghost has Mark Ruffalo (make some better movies, dude!) playing a lonely architect who moves into a San Fran apartment. Immediately, he meets up with a mysterious young woman (Reese Witherspoon) who can walk through walls, can't be seen by other people and insists that the apartment belongs to her. If you can't guess every single plot twist as well as every single line of dialogue here, then you've never been to the movies before. 95 minutes PG-13.