Strange Days: Book 1 of the William Magi Jr. adventures‪.‬

A dungeons and Dragons adveture with a scifi twist. Young William Magi's father has an accident and he finds out that his father is the originater of his favorite game; D&D. But there is a major twist, his father didn't invent the game, he wrote it based on an alternate universe that he discovered accidently 20 years before. So his business of import/export is to the other universe not another country.