I was a little worried when starting to read this because everyone said it was fantastic. And I really wasn't in the mood for a major dispointment. Thank god I was satisfied. Serena was such a fun character to read about. There were so many funny things that she said, and it wasn't overly played at all. I've actually used some of their comebacks. fuahaha. I couldn't fully understand Serena's relationship with Kori though. Kori was always being to cruel and heartless. Yeah I know in the end Kori is there for Serena, but who would put up with it? Why would Kori keep something so big from Serena for so long? I just find it hard to believe that two people so "close" and dependent on each other could make each other feel so crappy. Still I looked past this remembering all of the horrible things my friends and I went through and all the crap they pulled with me. Sometimes it doesn't matter. That aside I loved the whole story. Kori dying really changed and affected Serena. I enjoyed reading about how Serena trying to BE Kori, but in the end learning how to really be herself. Overall I think that Undone was one of the first books I read that showed a REAL friendship that isn't all cupcakes and rainbows.