Suppose Harry Potter and the Philosopher's Stone is a fantasy novel written by British author J.K. Rowling. It is the first novel in the Harry Potter series and Rowling's debut novel. The story follows Harry Potter, a young wizard who discovers his magical heritage and begins his education at Hogwarts School of Witchcraft and Wizardry.
Can we infer that "Harry Potter and the Philosopher's Stone is the last book in the series."? Yes, no, or maybe?