Writing In 2015, Costner co-authored The Explorer's Guild: A Passage to Shambhala, a hybrid adventure novel and graphic novel, with John Baird, researcher Stephen C. Meyer, and illustrator Rick Ross.
Writing In 2015 Costner co-authored The Explorer's Guild A Passage to Shambhala a hybrid adventure novel and graphic novel with John Baird researcher Stephen C Meyer and illustrator Rick Ross