The second half is better than the first half. In Wither is about a post-apocalyptic (a world war had melted the ice caps and destroyed all the continents on the planet except for North America) dystopian society and our heroine is sixteen-year-old Manhattanite Rhine. Cancer and other terminal illnesses had been cured, but as a uh, karmic consequence, all humans born thereafter are infected with a "genetic virus" which gives them drastically shortened lifespans - twenty for females and twenty-five for males. So you have the rich and the wealthy young men kidnapping young girls for their harem, where these teen breeders are pampered and live in luxury until they croak in a spray of bloody vomit. 
 I had trouble getting through this one. So, you know the cliche "show, don't tell"? There was too much telling and not enough showing, so I had difficulty engaging with what was going on. The narrator was a complete cipher - the only thing distinct about her was her heterochromia - I really didn't care about her or any of the characters.The dystopian world was a bit on the silly side and I probably spent too much time contemplating the plausibility of this "genetic virus". But then again this book is written for teens, so maybe I'm just too old to appreciate it for what it is. :P I doubt I will read the rest of the series.