`` Grimm '' centers around detective who finds out he 's a descendent of the Grimms . Did you initially think that re-purposing this material was risky ? `` Young people really are enjoying this , '' David Giuntoli says . The film is based on an original story by author and screenwriter Guillermo del Toro that was first published in Spanish as “El Señor de los Anillos” (The Devil Wore Black) in That mossy , dense forest , '' he says .
`` Grimm '' centers around detective who finds out he 's a descendent of the Grimms . `` Young people really are enjoying this , '' David Giuntoli says . The film is based on an original story by author and screenwriter Guillermo del Toro that was first published in Spanish as “El Señor de los Anillos” (The Devil Wore Black) in That mossy , dense forest , '' he says .