Question: how many books in the lying game series
[{'answer': '6', 'provenance': [{'wikipedia_id': '31049182', 'title': 'The Lying Game (book series)', 'start_paragraph_id': 9, 'start_character': 10, 'end_paragraph_id': 9, 'end_character': 11, 'bleu_score': 1.0, 'section': 'Section::::Publication history.:Original series.\n'}]}]