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Magic Greece was indeed magic. Hermione, Harry, Ginny, Ron, Charlie (and somehow Draco) are exploring Greece and Greek culture.
What will happen if Hermione will ignore a prophecy given by Cassandra? Would the real world will be still real? Or would the thin line between real world and Ancient Greek realm disappear?
In her journey between of worlds, Hermione will see a lot of known faces in unknown realm. Will she be ready to separate the dream from consciousness?