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One possible theme of the story "Nethergrave" by Gloria Skurzynski is the dangers of living in a virtual reality and the importance of facing reality. This is shown when Jeremy, the main character, realizes that the virtual world he was living in was not real and decides to go back to the real world.
The following quote from the story supports this theme: "I couldn't escape reality by hiding in the virtual world [...] reality is where I belong" (Skurzynski 6).