In Keith Brooke's novel, earth is going to hell in a handcart under the burdens of overpopulation and climate change. Noah Barakh is the architect of the the Accord, the virtual reality to which people can be uploaded after their death on this earth, a kind of secular heaven. Straining available computing resources, the Accord soon migrates to some kind of superpositional quantum state (physics a bit dubious here) where it turns out that there will be many Accords, a kind of 'many virtual worlds' interpretation of QM then.
The Accord is actually a love story: brain and brawn competing for the feisty Priscilla. The brawn is elector Jack Burnham, a 'big man' who is used to getting what he wants and utterly ruthless in his methods. What he mostly wants is to possess his wife Priscilla and kill the man she has become attracted to, Professor Noah Barakh. This vendetta moves from real space-time to the Accord virtuality and then through many alternative virtual worlds.
Initially I thought the writing was a bit self-consciously clunky, but the pace soon gets up and the novel becomes a bit of a page turner. Brooke's characters are never less than real and what a scary bunch they are. He has a real feel for the dangerousness of powerful, implacable men. And this is a well-imagined description of what virtuality could really be like. With complex heros and antiheros, sex and violence, high-concept tech-extrapolation and a racy and intricate plot, what's not to like?