This world has been terrifying to me from the start, probably because it doesn't seem all that out there. I could see us messing with genetics and diseases and inadvertently discovering that we have created a virus much worse than any disease we currently face. A disease that decreases our life spans significantly. 
 Besides that I have really loved watching the characters in this trilogy evolve and develop so much. Cecily is the best example of that. The annoying Cecily found at the beginning of the trilogy is nowhere to be found in Sever. Honestly, I really think that out of the ridiculous amount of dystopian trilogies published in the last decade, this is by far one of the best. 
 Enough gushing about the trilogy. You're reading this because you want to know whether or not Sever was a worthwhile conclusion. I'm here to tell you that it most definitely was! Sure, there were some things that really bugged me and one thing that may have made me a tad angry. (If you've read Sever then I bet you know what made me the angriest.) With that said I think everything was resolved so nicely. I'm very satisfied with this conclusion! That's all I can without spoiling the ending, so you better just go and read Sever!