Treasure in the Royal Tower is one of the best computer games I ever played. This is a great starter Nancy Drew game for starting off because it's not too hard nor too easy. If you want a really easy game try the Haunted Carousel.
The story goes that you, as Nancy Drew, are snowed in at a ski resort in Wisconsin with an interesting history. In this game you learn about the French Revolution and Marie Antoinette.
"So, what's the mystery?" you ask. I'm getting to that.
There is a tower shipped over from France and was put back together on Wickford Castle, the ski resort you are staying at. The library at Wickford has been vandalized, and it takes a lot more than barging through the front door to investigate. Later, you hear about Marie Antoinette having a crown worth millions and somehow you figure that the library and treasure are connected. Your job is to find out the story behind the treasure and library.
This game took me about four days to beat. It's quite challenging in parts, like the ski lift, but you can get through it. It's also a little frightening, like the banging noises, but not too frightening that you never want to play it again, like the Final Scene. All in all, Treasure in the Royal Tower is a great game and everyone should buy it.