The story of two sisters, of two lovers' imagined story, of those four people intertwining through decades. Richly imagined and told. I really don't know what to say about it--it took me forever to get through the first half, for no good reason (I was just distractable, I guess), but once I committed to it, the second half was pretty quick. It's not my favorite of her books that I've read so far, but I can't think of any reason not to give it 5 stars--there was nothing I can point to that I didn't like about this. So, five stars it is. 
 I still prefer Oryx and Crake, though.