"There are more things in Heaven and Earth, Horatio, than are dreamt of in your philosophy." - Hamlet (Act 1, Scene 5). A naïve angel and amoral demon discover the truth of Shakespeare's words, when a wager between God and the Devil lands them on Earth. In the guise of Las Vegas private eyes "Gabe Horn" and "Lou Cypher", the archangel Gabriel and trickster demon Lucifer embark on personal quests of their own in search of their humanity. Their personal journey is also a physical one, spanning both time and dimensions, through the centuries to Camelot and 17th century Salem, exploring the seven Heavens, the nine levels of Hell, the Dark Dimension of the ancient Dark Gods, Thenesia - an ancient land of swords and sorcery, the somnolent realm of the Dreamscape, and the eerie emptiness of Limbo. Beneath the prosaic veneer of urban life, mortal humans live in blissful ignorance alongside preternatural and supernatural creatures: warlocks and witches, vampires, werewolves, the Fae, kitsune, and creatures whispered of in myths of African, Irish, and Japanese cultures. Seers gaze at the Sands of Time as the golden grains tumble through the mystical hourglass, seeking to divine what the Fates have woven. Through these memorable characters and exotic settings, the author explores the nature of good and evil, free will versus predetermination, man's inhumanity to man, universal versus moral relativism, nature versus nurture, loss of innocence, coming of age, death, love and friendship, the quest for power, individualism, sacrifice, and faith versus doubt, among other literary themes. This Omnibus Edition collects all four volumes in the Halos & Horns fantasy saga, replete with new illustrations; the "Guide to the Halos & Horns Multiverse" detailing each character, place, and object; previously unpublished essays by the author; and the novelette The Pandora Chronicles, a preview of the forthcoming spin-off, Fangs & Fur.