Suppose Harry Potter and the Philosopher's Stone is a fantasy novel written by British author J.K. Rowling. The book was first published in 1997 under the title Harry Potter and the Sorcerer's Stone in the United States. It is the first novel in the Harry Potter series and follows the story of a young wizard, Harry Potter, and his friends Hermione Granger and Ron Weasley as they attend Hogwarts School of Witchcraft and Wizardry.
Can we infer that "Harry Potter and the Philosopher's Stone is the last book in the Harry Potter series"? Yes, no, or maybe?