As usual with this series, I enjoyed the book. However, I prefer to avoid depressing books. I know they are amazingly meaningful (and that I am a massive hypocrite, considering Diabolus ex Machina is a tragedy), but that's just the way I am. I want to be happy during my free time. 
 So, it only gets four stars. 
 (view spoiler)[ I'm not a big fan of plagues :( (hide spoiler)]