Play one side against the other!
Such is the gameplay of Indigo Prophecy, more like a movie where you can interact with almost everything, including some parts of the storyline.
You will take control of Lucas Kane (the murderer) and detectives Carla nad Tyler, just like in a movie you'll see things through both sides (ggod guys and the "bad" guy), not to mention you'll get to know the drama of their lives.
That way you can know precisely what to do when you shift controls from the criminal to the detective, but then again, you might not want to make things easy for the cops and so not give hem a chance to find that missing item that will link Lucas to the murder, or vice-versa. Or maybe you just wanna see things get messy and play one side against the other.
The music of the game is perfect in every sense, stabilishing just the right mood for the moment. The graphics could be better though, but it's not as near as being a bad graphics.
All in all this game is one to buy. It's a game that entertains you no matter how heavy it is it's content, you never want to stop playing.