Becky, I just played the demo by linking to the link you said to go too and clicking on the download button toward top right. I had no problem downloading it after a minute wait. I finished the demo basically it tells you what the story is about.
you get to go to a few places but really doesn't let you get into the story much and you do nothing with the objects you find except go to the next destination. Hope this explains the demo the only thing about Carol Reeds games I always wonder why the people don't move their lips. A trivial thing to some but for me it makes the game more real.