The Diamond of Darkhold

The Diamond of Darkhold by Jeanne Duprau is the fourth and final book of Ember This book contains 285 pages of adventure that leads to the finale of the Ember Series. Doon and Lina (spoiler alert) go back to Ember to find a mystical object that a book was written about for the people of Ember. Something terribly horrible happens and Lina has to go back to Sparks to save something or someone. Not before another unexpected thing happens where Lina ends up not going back to Ember but herself rescuing the troubled person in need. I do not want to give much away so all I am going to say is Doon and Lina are both safe in the end.