What Dreams May Come in the book are derived from my wide range of reading." One of Matheson's influences was Harold W. Percival, an adherent of Theosophy, a belief system with a strong Eastern and Hindu influence. The story also shares the same theme of the ancient Greek myth Orpheus and Eurydice, in which the gifted musician makes a challenging journey to Hell to retrieve his wife. One character quotes from the writings of 18th century Christian mystic Emanuel Swedenborg. Matheson bases his descriptions of the death experience itself on studies by Elisabeth Kübler-Ross and Raymond Moody. When reading these accounts, Matheson found that
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