After the raid on the Mount Weather base, the impossible happened - Katie fell into a trap. The only thing that matters now is getting her out. Remove anyone who gets in the way? Consider it done. Blow up the whole world to save her? With pleasure. Uncover the secret of your alien race? Of course. When surrounded by enemies, there is only one thing left to do - adapt in order to save your life. Much of what previously seemed obvious is now not so. What is the real threat? Read the continuation of the novels “Obsidian”, “Onyx” and “Opal”!