The story is told in epistolary format, as a series of letters, diary entries, newspaper articles, and ships' log entries, whose narrators are the novel's protagonists, and occasionally supplemented with newspaper clippings relating events not directly witnessed. The events portrayed in the novel take place chronologically and largely in England and Transylvania during the 1890s and all transpire within the same year between 3 May and 6 November. A short note is located at the end of the final chapter written 7 years after the events outlined in the novel.