No one knows who Cornelius Shiel really is. Oscar Wilde himself tried to meet him, without success. And yet, it is an insignificant New York journalist at the start of his career that the most intriguing man of the end of the 19th century chose to entrust the writing of his memoirs: a frightening story, with hints of sulfur, capable of shaking the strongest minds... a story recounting the memories of a agent of evil.