Firefight discussion

Firefight, wrote by Brandon Sanderson,fantasy,mystery book, about David Charleston, finding his unanswered questions. David,Prof,and Tia go to a group of reckoners in Babylon Restored, the flooded city with people living on the top of sky-scrapers. They are going to Babylon to stop Regalia, a very powerful epic, one with powers able to kill millions. Calamity, a star appearing out of no-where, is said to be the reason why humans turn into a whole different creature, called an "epic". Although, David is more concerned about getting his answers about Firefight, another "epic", rather than fighting Regalia. I would rate this book a 4 out of 4 stars, it was very tense and was holding my thoughts on it for a long time.