Etidorhpa
John Uri Lloyd
 The complex structure of the books begins with a Preface signed by Lloyd, which presents the frame concept, that Lloyd has discovered a thirty-year-old manuscript by Llewellyn Drury in a library. Then comes a Prologue in which Drury introduces himself. The book's Chapter I begins the story of how Drury met the mysterious "I-Am-The-Man", who reads his own manuscript account of his adventures to Drury over many sessions. The mysterious stranger, also known as The-Man-Who-Did-It, relates events that supposedly occurred thirty years earlier, during the early part of the nineteenth century. By his account, the speaker is kidnapped by fellow members of a secret society, because he is suspected to be a threat to their secrecy. (This was likely based on the 1826 kidnapping of William Morgan and the start of the Anti-Masonry movement.) I-Am-The-Man is taken to a cave in Kentucky; there he is led by a cavern dweller on a long subterranean journey. It becomes an inner journey of the spirit as much as a geographical trip through underground realms. The book blends passages on the nature of physical phenomena, such as gravity and volcanoes, with spiritualist speculation and adventure-story elements (like traversing a landscape of giant mushrooms). The whole ends with a summary letter from "I-Am-The-Man" and a conclusion from Drury. Subsequent editions of the book added various prefatory and supplementary materials.