Netcromancer

The first part of a visual novel series mixing mystery and sci-fi. It is also, more specifically, a conversation simulator for people who like robots and dead wives. Features: lots of choices that exist for their own sake, and some down-home fake-deep sci-fi philosophy that is at least earnest about it. About thirty minutes per playthrough, with multiple paths and enough options to easily double that with gumption and time to spare.