This was awesome. It was basically book 5 in the Lunar Chronicles. It's all about the rogue pack of wolf soldiers that are left from the war and that they're coming back to get revenge on the Lunar Queen, Selene/Cinder, whose ancestors made the wolves what they are: brutal, savage beasts. They want to be men once more and figure that getting the reversion of this is key to the final battle against the Lunars. 
 This volume was full of action. The plot was amazing and hinted at some potential allies in the future instalments as well as what the future of this treaty between Earth and Luna could look like in the coming books. I can't wait for volume 2.