Sir Orfeo as being a parallel dimension to the everyday world rather than the Land of the Dead as in the Greek myth of Orpheus and Eurydice. The ability to move between one world and the other distinguishes the tale as told in its various British versions such as "Sir Orfeo" and the Shetland ballad "King Orfeo" where the captors are envisaged as inhabitants of a parallel fairy domain rather than as the infernal region of the Dead ruled over by Hades as in the Greek myth. Katharine Briggs sees the tale as related in British folk narratives as being equally influenced
The House of Hades Tartarus at Barnes & Noble. A paperback edition containing the short stories "The Crown of Ptolemy" and "The Sword of Hades" was launched in the United States on March 31, 2015. "The House of Hades" sold over 350,000 copies during the first week, 26% more than "The Mark of Athena" during a comparable period. Upon release, the book ranked 1 on "The New York Times" bestseller list, "USA Today"s bestseller list, "The Globe and Mail" bestseller list and "The Wall Street Journal" bestseller list, and was the seventh-bestselling book on Amazon and fifth in the Nielsen BookScan. The novel received