The Heroes of Olympus
During his tour to promote the last book of "The Kane Chronicles", titled "The Serpent's Shadow", Riordan read part of the first chapter of "The Mark of Athena". The cover and full first chapter were also released on Disney's "The Heroes of Olympus" website. On September 27, 2012, Riordan confirmed that there would be a first US printing of 3.5 million copies.