It is the most compelling music ever invented. Born of a wildly successful computer game, Angel music has taken the world by storm. Some worry about the way it hypnotizes its listeners; others, that its addicts can become violent - but most are simply captivated by its beauty. Behind the music from the computer game called The Angels' Key are three brilliant young men. Their goal is to create a perfect musical scale, and with the help of the enormous computing power the game's addicts bring when they play it, they are getting very close to success. Soon, the music's hold grows ever stronger, the musical scale comes closer and closer to perfection - and the world comes to the brink of an unimaginable catastrophe. One that can only be averted by an unimaginable sacrifice.