Lady Severin Arkmont has nothing left but a dying breath?until she offers it to the thing sealed beneath the Cathedral of Black Glass. In exchange for immortality, she becomes his Living Reliquary: a sacred vessel bound to his midnight altar, worshipped and devoured in equal measure. Within the frozen obsidian sanctuary, ecstasy is indistinguishable from death, and salvation tastes like copper and sin. As the rites grow darker and her master's hunger more profane, Severin discovers that the only pleasure sharp enough to touch her immortal flesh is the one that carries the flavor of her own obliteration...