Ron Howard has revealed he is still working on his Dark Tower film - but has taken a "vow of silence" about the project.
The Oscar-winning filmmaker has long been planning to adapt the Stephen King sci-fi novels for the big screen, and has now said that although it has been delayed the movie is still in the pipeline.
But the Rush director told Empire magazine in a podcast that he won't be giving a timetable for the project.
"The Dark Tower is something that we're still working on," he said. "We've all taken a vow of silence about the progress, the headway, what we think our timetable is, because I don't think I realised how much media interest there was in the title and how much excitement there was.
"It's a fascinating, powerful possibility and even Stephen King acknowledges it's a tricky adaptation, but to be honest, from a financing side, it's not a straightforward, four-quadrant, sunny superhero story - it's dark, it's horror. That edge is what appeals to me, the complexities of those characters is what appeals to all of us."
He went on: "So my answer is: it got delayed, it's never gone away. We're working on it, and Stephen is very patient with us, and Akiva's (regular screenwriting collaborator Akiva Goldsman) just gone off and directed a movie (Winter's Tale), I'm continuing to work, but the Dark Tower dreams - fever dreams, rather - are still there, but we're not going to give it a timetable."
The Dark Tower is a series of books from author King, incorporating themes from multiple genres, including fantasy, science fantasy, horror and Western. The series is about a roaming alternate universe cowboy named Gunslinger as he embarks on a quest towards a tower.
In 2011 there were reports that James Bond star Javier Bardem was in talks for the lead role.
When it first emerged that Ron would be adapting the Dark Tower, it was also announced that a TV miniseries would follow the film.