“The Great God Pan” is Ross Crean’s operatic adaptation of the horror novella written by Arthur Machen in 1894. On publication, it was widely denounced by the press as degenerate and horrific because of its decadent style and sexual content, although it has since garnered a reputation as a classic of the supernatural and unnatural. It is the story of an experiment gone wrong, and the terrifying results that follow years later, as a rash of suicides hit London. The center of the mystery is a young woman who has taken London society by storm, but has many hidden secrets of her own. Can she be the culprit of such actions, or something much worse?