Suppose Harry Potter and the Philosopher's Stone is the first book in the Harry Potter series written by J.K. Rowling. It was published in 1997 and follows the story of a young wizard, Harry Potter, as he attends Hogwarts School of Witchcraft and Wizardry.
Can we infer that "Harry Potter and the Philosopher's Stone was the last book in the series."? Yes, no, or maybe?