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 to do what is right." "The House of Hades" won the Goodreads Choice Award for the Best Middle Grade and Children's Book of 2013. On the same day as the release of "The House of Hades", Rick Riordan announced its sequel, "The Blood of Olympus", the last book of the series. The cover, featuring Jason, Frank, Hazel and two giants, was released on May 14, 2014. The first chapter of the story was released along with "The Staff of Serapis", a crossover between "The Kane Chronicles" and "Percy Jackson & the Olympians". "The Blood of Olympus" was released on October