Question: Who wrote an unofficial sequel-series of J.K. Rowling's Harry Potter universe, that enters around the character of James Sirius Potter who makes a fleeting appearance in the  final novel  of the "Harry Potter" series, written by British author J. K. Rowling?
{'answer': 'G. Norman Lippert', 'supporting_facts': [['James Potter (series)', 0], ['Harry Potter and the Deathly Hallows', 0]]}