This book has an interesting premise – a dystopian future has a two class society and they discover how to jump between parallel dimensions. In order to survive the jump, your counterpart in the new world must not exist (ie to already be dead). Since the people from the poor lower class are much more likely to have died in other similar worlds, they are the most useful to train as jumpers.
I have read other books with similar set ups – The Long Earth series by Terry Pratchett and Stephen Baxter, and the wonderful Pandominion books by M.R. Carey, both of which I loved, this one, somehow never really grabbed me. It was alright, but I don’t think I’ll bother reading any more in the series.
Sarah Wray Writer 