Given that for Pullman "some themes, some subjects, [are] too large for adult fiction [and] can only be dealt with adequately in a children's book" ("Carnegie"), and that "the most important subject" among those too large for adult fiction "is the death of God and its consequences" ("Republic" 655), Pullman can then assert the seriousness of HDM in terms of both its subject and its generic form in which, like in the Republic of Heaven, "fantasy and realism [...] connect" (661).
"We need a story," he famously declares in "The Republic of Heaven,"