Darkness Shall Fall — Alister E. McGrath

It's been two months since the volcano erupted, releasing a strange, evil power from deep within the earth, and Peter, Julia, and Louisa find themselves trapped alongside the people of Aedyn. Worse, neither Peter nor Julia knows how to lead the people home, and Louisa's plan for freedom results only in anxiety. As the power surrounding the Shadow grows, a stranger arrives claiming to be a messenger of the Lord of Hosts. Peras promises to get everyone to safety, but his presence leaves the siblings wondering whom to really trust. In this dramatic conclusion to the Aedyn Chronicles trilogy, Peter, Julia, and Louisa must decide whether to fight for what they know to be true, even when the fight seems hopeless. Can Peter and Julia lead the revolution, and will Louisa find the courage to face her own destiny?