Question: when does the next book of trials of apollo come out
[{'answer': 'Fall 2019'}, {'provenance': [{'wikipedia_id': '50985871', 'title': 'The Trials of Apollo', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 326, 'bleu_score': 0.9388737582001561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 698216461312674534}, 'section': 'Section::::Abstract.'}]}]