The upcoming film, A Monster Calls, has a very interesting backstory that is shared in the video below. It's based on an idea for a book by Siobhan Dowd who passed before she could write it. Then it was picked up by Patrick Ness who wrote the novel and then the screenplay for the film.
The film stars Liam Neeson, Sigourney Weaver, Lewis MacDougall, Felicity Jones and Tony Kebbel. and hits theaters on January 6th.