I played this game a while back and have been looking to play it again (but one of my discs had cracked while playing). The steam version seems to be better configured to run on modern systems than the Gog version (have tried both - gog was unplayable).

The gameplay blends FPS and third person adventure mechanics to investigate a mystery in a cyberpunk setting (the switching back and forth gameplay was pretty innovative for the era - 1999). In addition the ability to switch your character (the you that you're playing as) between various characters (of different genders and races) in the setting provides an intersting way to explore those identities within the culture. But you still play as you regardless of the shell you're... inhabiting?

Also... New Angels of Promise (by David Bowie) is the theme song and it's awesome.