Question: what book comes after locked on by tom clancy
[{'answer': 'Threat Vector', 'provenance': [{'wikipedia_id': '30765', 'title': 'Jack Ryan (character)', 'start_paragraph_id': 51, 'start_character': 12, 'end_paragraph_id': 51, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Second Ryan administration.:"Locked On" (2011).\n'}]}]