Five years have passed since the end of the Great War. Serephine Bachaumont--vampyre, shipping magnate, and French spy--has scoured the earth searching for Mametu the capricious fate goddess who was unleashed upon the world in the final desolate year of the war. Receiving critical clues leading to Mametu's base of power, the ominous Mount Nightmare, Serephine gathers an elite team trekking to the end of the world for a climactic showdown with her immortal nemesis. Tested like never before, Serephine must cross raging rivers, untamed jungles, and soaring mountain peaks, facing physical and spiritual barriers that will challenge her like nothing before. As she pierces the wilderness, Serephine contends with the magnitude of facing a powerful god while fighting against the inevitably of colonialism. Deep inside Mount Nightmare, Serephine makes discoveries that shake the foundation of humanity and civilization as she knows it. Her body and soul at stake, Serephine finds herself questioning the nature of existence and creation. She is forced to make choices that impact the destiny not only of herself but her allies and the future of all humanity, where she learns that deep inside the Temple of Horror, there is no time for mistakes.