Gwen Frost, Nike's Champion and psychometric Gypsy, has been though a lot. Reapers, Rocs and Fenrir Wolf Pups have all done their best to try and quash Gwen and her friends but they haven't succeeded. And now it's time for the final battle. Nike's followers verses Loki's Reapers. Gwen knows she isn't alone. She has Vic, Logan the Spartan, Daphne the Valkyrie and a whole bunch of friends to back her up... but Gwen knows that she is the key to locking Loki back up but she hasn't the slightest idea how she is supposed to do it. 
 I've been a big fan of this series since I read the first book a few years ago. All kinds of mythology, boarding school and some fantastic characters. It's always sad when a series you're enjoying comes to a close but as the saying goes - all good things must come to an end. Gwen is trying to navigate her first romantic relationship with Logan whilst trying to decipher Nike's cryptic advice. The Reapers are out in force, stealing artifacts and rearing up for a big finish. 
 One of the things I've come to love about this series is Gwen however I wasn't the biggest fan of her in Killer Frost. I want characters to grow and mature as people as their get older. To have their experiences improve them. But in this book Gwen regressed slightly. She's not learned that she's stronger when she has her friends beside her and constantly reminding everyone that she's the only one that can defeat Loki. I understand that she has a lot on her shoulders. That she is the chosen one. But it felt somewhat out of character to me for her to be shunning those who can help her and still taking such disregard for her own safety - especially since she knows if anything happens to her then the entire world is at risk. 
 The way the final battle went down was great to read. It incorporated so much of what the things I loved about the previous books as well as new things I wasn't expecting. The ending was perfectly fitting for all of the characters and I liked seeing familiar faces showing up again. 
 I'm glad that I read this series. It's fun and I really enjoyed how the mythologies were incorporated together. It feels like we may get a spin-off and if that does happen I will definitely be reading it too! 
 Thanks to NetGalley and Kensington Teen for the review copy.