Thor: The Dark World(Book 2)

For the past year, Kaitlyn, who is 11-years-old now, has been vacationing in London with her good friend and guardian, Clint Barton. While things have been quiet since the Battle of New York, Kaitlyn is suffering from PTSD and nightmares and tries to hide it from Clint. Knowing about her recent change in behavior, Clint attempts to help Kaitlyn but she keeps brushing him off and decides to spend a day with her friend Will Jones. When Kaitlyn accidentally comes into contact with a strange entity known as the Aether, Thor returns to Earth and brings her to Asgard before the Dark Elf Malekith captures her and uses the weapon to destroy the Nine Realms-including Earth!