I hesitated to read this one because it's the last book in the series and I HATE reading final books in series. They make me sad because the story is over and I worry it won't live up to my expectations. "Kitty Saves the World" didn't blow me away but I liked it. The story did leave me with a desire to go back and re-read the first book. I didn't like it the first time I read it and gave away my copy. Then a friend gave me book two and I loved it. :D That pretty much sums up the series for me, it's been up and down all the way but it's been a heck of a ride. I wonder though if my reactions to that first book would have changed over time. I'm sure my library has it so I'll find out at some point. :) 
 Vaughn brought back characters from earlier books but she didn't go crazy; they served a purpose in the story and at least one is a fan fave. Certainly, I was happy to see that person return. There was also a surprise new character. I say surprise, but when I thought about, it made sense. He was interesting and I kinda liked him and I kinda wanted to drop him on Ceti Alpha 5 without any food or supplies. There are some other players, rather mysterious, that I have mixed feelings about. Their presence was logical given the introduction of the other new character but they felt too much of an easy out for some things. And there's a twist in Kitty and Ben's personal life that also left me with mixed feelings. I think the book would have been stronger without the epilogue. 
 The story brings the whole Long Game and Dux Bellorum story lines to a conclusion. It's not a rousing conclusion, it felt anti-climactic, but it did showcase Kitty's growth during the series: her strength, her ability to ask for and to accept help, her quick thinking, and her compassion. But story threads are tied up and there's even a happy ending. It was a little slow at times and there were a few too many convenient moments, but "Kitty Saves the World" was solid story telling with good character development and Kitty's trademark snark and wit. 
 I do hope Cormac and Amelia will get their own series, and not just because then we get to see more of Kitty, Ben, and the gang. I disliked the whole idea of Amelia when she was introduced but I've grown to like her and her and Cormac together. Cormac, of course, is just cool. :) 
 Go; grab "Kitty Saves the World". It may not blow your socks off but it's a good ending to the series.