"Tree of Smoke" writer Johnson's new novel tells the story of a Scandinavian man, Roland Nair, who travels to Sierra Leone for the wedding of his friend Michael. The duo and Michael's fiance Davidia travel to meet Adriko's clan in the Uganda-Congo area, but all are hiding something. "There's this great, strong relationship between [the men], but they're also tormented," says Nelson. "[The book] is very strong."