Science Fiction has always been about ideas, about action and adventure - about The Story. The language used to tell the story, well, that's not as important. As long as it is not obtrusively bad, SF fans can live with workmanlike prose, if the ideas and events are interesting.
And then there is Robert Charles Wilson. Yes, he has ideas and plot twists like all SF authors. But man does he know how to WRITE! I am in awe of the subtlety and power with which he uses the English language. In a few sentences, he can evoke a sense of atmosphere or place that is deeper and clearer than any SF author I've read. His characters are complete, nuanced, flawed but endearing. His writing is lyrical, rich, even poetic. His novels are not just SF, they are literature, which is rare in the genre.
I know this review doesn't say much about the plot, which is well conceived and executed. You'll enjoy it, trust me. But the glory of a Robert Charles Wilson novel is not so much in the story as in the story-telling. I read a lot of SF, and I believe Wilson to be the finest Writer in the field. He is amazing. Prepare to be impressed.