Lavie Tidhar's space opera sci-fi tale "In Xanadu" is a Tor.com Original. Security through physicality. Security through redundancy. Security through obscurity. How do immortal artificial intelligences defend themselves? With an air gap. With a security force that has no connection to anything that can harm them. With a young woman, trained to fight and to die who, along with her cohort, must keep them safe. But in Xanadu things don't always go as planned... At the Publisher's request, this title is being sold without Digital Rights Management Software (DRM) applied.