Roger Zelazny

Loyally accompanying a mysterious knife-wielding gentleman named Jack on his midnight rounds through the murky streets of London, good dog Snuff is busy helping his master collect the grisly ingredients needed for an unearthly rite that will take place not long after the death of the moon. But Snuff and his master are not alone. All manner of participants, both human and not, are gathering with their ancient tools and their animal familiars in preparation...