I have previously read three other (stand alone) novels by Adam Roberts, namely Stone, Salt and On. Well...Polystom makes 4 and I will not be buying a 5th. I find myself buying his books because the ideas and concepts of this author are brilliant - especially when presented in condensed 'synopsis' form on the Amazon website. The problem is - I have yet to witness a successful implementation of Adam Roberts' brilliant ideas. Maybe he would benefit from teaming up with a co-writer who could take the stories a step further and actually make me care about events and characters along the way. I'll rate this one at 3 stars - solely for for the interesting concept.