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...