These reviews I found would express what I think better than I can.
"Part mythic cycle, part fictional history of Moore's hometown, part collection of fireside ghost stories, Voice of the Fire is as clever and well-crafted as Moore's other genre experiments, and by taking his dialogue out of word-balloons and panel arrangements, it gives his limitless literary ambition room to stretch out into new and fascinating forms." -- Tasha Robinson, The Onion
"[Voice of the Fire] blends witchcraft, savagery, subjectivity, and the darkness that lies within each of us. The resulting narrative is a meditation on the twisting annals of history, the supernatural world between life and death, and the oft-thin line between fantasy and reality." -- Lloyd Babbit, MetroPulse.com
By summoning up the voices of the dead and burned, Moore stakes his claim as a grand magician and, unlike his colleague in Oz, he invites us to look at him behind his curtain of fire. Now singing, now screaming, he signals his message through the flames." -- Adam White, Indyworld.com