He wrote about adventures and struggle of an aspiring knight, also named Millard, to conquer Raptenahad (a play on "rhabdomyosarcoma," the cancer Chris had), a magic-wielding evil queen who symbolized his illness.
[1][2] The story gave its name to the Four Diamonds Fund, a childhood cancer-centered charitable organization established in 1972 by Chris' parents Charles and Irma.
Millard decides to do this by ridding a distant land of the evil sorceress Raptenahad and liberate it of her many curses.
Eventually, his continued success enrages Raptenahad and, fearing for her life, she determines to destroy him on his final challenge, however he manages to overcome all obstacles and completes it too.
With the sorceress being no more, and her curses lifted, the knight takes over her former castle as his own palace and the story of Sir Millard begins.