Melisondra [bookish] rated The Heroes of Olympus Books 1-4 CD Audiobook Bundle : Book One : The Lost Hero; Book Two : The Son of Neptune; Book Three : The Mark of Athena; Book Four: 5 stars June 21, 2018 Public The Heroes of Olympus Books 1-4 CD Audiobook Bundle : Book One : The Lost Hero; Book Two : The Son of Neptune; Book Three : The Mark of Athena; Book Four by Rick Riordan