Rowling's first adult novel "The Casual Vacancy" didn't have a lot of success but sold millions of copies and now is a BBC 3 part mini series. It aired on BBC recently and on HBO on April 29th. HBO subscribers can watch it on the HBO GO service for free but for those who don't have HBO in the US can watch it on HBO Now. The service is free for the first month after which it be $14.99 per month. The catch is that you need an iOS device or Apple TV to subscribe to it, after which you can watch it on any web browser. If didn't read it you can probably watch it on HBO. Don't watch with with kids though as there is some adult content that wouldn't be suitable for kids. Happy watching!!