The series explores various Oak Island theories through conversations with independent researchers. Persons featured have included J. Hutton Pulitzer discussing his theory of ancient mariner visitations; Petter Amundsen discussing his theory about codes hidden in Shakespearen literature and a secret project involving Sir Francis Bacon and the Rosicrucians; Daniel Ronnstam discussing his theory about the 90 foot stone being a dual cypher; authors Kathleen McGowen and Alen Butler discussing their theory involving the fabled Knights Templar treasure and an alleged relocation of historical religious artifacts to the island; and John O'Brien discussing his theory that the island contains treasures of the Aztec Empire.