This book proved to be very inspiring for me and has a very important message about not ever giving up. A girl named Lina switches jobs with another boy to become a messenger on Assignment Day. She reveals some unknown regions and tries to find a way out of the place they live. There are many problems the people in the city of Ember had to deal with due to their insufficient light. Lina and her friend go on a miraculous but dangerous adventure and try to save their city from the darkness. Together, there might be a chance for them to find the passage leading out of the city where no one has been able to find before.