The City Of Ember by Jeanne DuPrau

When life as we know it is about to come to an end, a group of scientists decide to create a city underground. The city of Ember was built to last for 200 years and then when this time was over the Mayor must retrieve from a box of instructions how to return to the surface. Over time the message is lost after Mayors have died and new ones have come in not knowing about the box and now as the 200 years have just passed, life in Ember is rapidly deteriorating. The lights are flickering, bulbs are running low and food is being rationed. It's left to two kids Doon Harrow and Lina Mayfleet to lead the way out. This is a great book and is suited for boys and girls and takes you through a great adventure as you read wondering what will happen next as they go on their journey to find the way out. The People Of Sparks is the next book in the series as the adventure continues.