Fracture Me (Shatter Me, #2.5) by Tahereh Mafi 

In this short novella, Adam is thrown into chaos. He needs to get everyone to safety all the while trying to come up with a plan to save Juliette. Fracture Me, shows the emotions that Adam is going through in this time of turmoil. He is worried for Juliette and his brother who needs his full attention and help.