fun games with a real script

I am presently playing my third game in a series published by The
Adventure Company all based on the writings of Agatha Christie. I
played Murder on the Orient Express which I did not enjoy as much as
the first game based on her writings. And Then There Were None, this
game came with a copy of the book of the original publishing of her
Novel by the same title. There was also a movie made way back in the
40's I believe by the same title which followed the book. The game was
very close to the original story with several different endings.
Jack