The main character is a medical technologist who volunteers to have his head scanned and comes around in a game he used to play as a teenager and the adventures follows from there. In the game world (or is it real) he becomes Bedlam.
It has a mixture of comic and philosophy (don't get put off by that) asking the question if you were brain was scanned and is essentially a copy of you -
Is it right for someone else to use it anyway they want?
Who owns it?
Would you be able to tell the difference between being in a simulation or the real-world?
Is the real-world a simulation anyway? Not original but still interesting. See the relate bit below for more information.
Mix this with corporate greed and politics; adventure; retro-gaming and great comic writing, you have a book that is worth reading.
Links to the work mentioned in the book can be found at:
In Analog magazine: http://www.analogsf.com/2013_07-08/altview.shtml
S. Wolfram (2002) A New Kind of Science, Wolfram Inc.