Director Guillermo del Toro‘s haunting and beautiful Pan’s Labyrinth is one of the truly great films of the past decade. Now the movie is on its way to a second life, this time as a stage musical.

Del Toro, as if not already insanely busy with other things, has been working on the adaptation for four years now, interviewing and finding the talent to make it happen. He’s also already written the book—or libretto: the narrative structure that keeps a musical from just being a concert with people doing random things on stage, basically—with Jeremy Ungar.