Which book that takes place on Middle-earth is not part of the Lord of the Rings trilogy?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q15228', 'id': 0, 'label': 'The Lord of the Rings'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q206324', 'id': 1, 'label': 'Isildur'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q79734', 'id': 2, 'label': 'Middle-earth'}], 'links': [{'name_': 'P674', 'source': 0, 'target': 1, 'label': 'characters'}, {'name_': 'P840', 'source': 0, 'target': 2, 'label': 'narrative location'}]}