Born in Yate, Gloucestershire, Rowling was working as a researcher and bilingual secretary for Amnesty International when she conceived the idea for the Harry Potter series on a delayed train from Manchester to London in 1990.[11] The seven-year period that followed entailed the death of her mother, divorce from her first husband and poverty until Rowling finished the first novel in the series, Harry Potter and the Philosopher's Stone (1997). Rowling subsequently published 6 sequels—the last, Harry Potter and the Deathly Hallows (2007)—as well as 3 supplements to the series. Since, Rowling has parted with her agency and resumed writing for adult readership, releasing the tragicomedy The Casual Vacancy (2012) and—using the pseudonym Robert Galbraith—the crime fiction novel The Cuckoo's Calling (2013) which, according to Rowling, is the first of a series.