What is the main conflict in Shoeless Joe by W. P. Kinsella?

Canadian writer W. P. Kinsella's first novel, Shoeless Joe, published in Boston in 1982, is an ingenious baseball story that smoothly weaves together fact and fantasy. The narrator, Ray Kinsella, is a baseball fanatic and dreamer who owns a farm in Iowa. One day he hears a mysterious voice saying, "If you build it, he will come." Ray believes this is an instruction to build a baseball field at his farm and that the "he" is his father's hero, Shoeless Joe Jackson, one of the greatest baseball players of all time. Jackson was banned from baseball for life following the Black Sox Scandal of 1919, in which he and seven other players accepted bribes to throw the World Series. From this premise, Kinsella spins his tale full of magic and nostalgia. Shoeless Joe shows up, and Ray continues to pursue his dream, even traveling cross-country to kidnap the reclusive writer J. D. Salinger, who joins Ray in his quest to restore the broken dreams of the past.