More like 3.5 stars. 
 Cress (Rapunzel) has been locked away on a satellite her entire life by the evil Lunar queen. That is until she gets in touch with those also plotting against Queen Levana and they conspire together for her escape. 
 Majority of this book is about plotting how to over turn Queen Levana and keep her from overtaking the Commonwealth. 
 Don't read below because it's mainly just a heavy recap for me to refresh on when Winter comes out haha. 
 (view spoiler)[ 
 Oh Dr Erland was not only the one who let Cinder know who she really was, but he is hoping for redemption because he was the scientist who created the wolf hybrids! I love how everything ties back in these novels. & then he's also Cress's father! So many tie ins ! ! They're blowing my mind with joy. 
 Oh man no! Not Scarlet! Stupid Sybil took her away in this book by tricking Cinders mind. Only for Scarlet to be constantly tortured with lunar mind tricks by a CHILD! While Wolf is being tormented trying to get back to her this whole time and rescue her. 
 Thorne's positivity. Despite going blind after the satellite crash he still manages to keep Cress's hopes up and get them to safety. Also while cracking his silly jokes along the way. While tracking through the desert they eventually come across a group of people that lead them to "safety." Only for the news to broadcast about a fallen satellite containing Lunars and for their new friends to betray them and ship Cress "away." Only away is to Dr. Eland who Cinder is already with ! 
 Eventually the entire team and crew break into the castle and abduct Emperor Kai. Then him and Cinder have their moment finally on the ship where she pretty much tells him everything about her being a princess and her goals to stop Levana. 
 (hide spoiler)]