After visiting Earth on a whim, a young space traveler finds a planet empty of people. She happens upon a strange contraption that shows her images of what the planet used to be like, and through this viewfinder, we see Earth as it was juxtaposed against Earth as it is: abandoned by people, but still full of amazing things. Her adventure takes her to a museum full of hints about the planet's past, a library that has become home to a variety of zoo animals and an abandoned but beautiful train station from which she has to make a daring escape. As she wanders, though, she sees signs that perhaps there IS still someone here. A time capsule, a friendly cat and a makeshift train all add to the mystery . . . is she really alone?