“The Unfolding,” by A.M. Homes (Viking) If you ever wondered who was behind the Jan. 6, 2021, insurrection, pick up a copy of A.M. Homes’ new novel, “The Unfolding.” The book, Homes’ 13th and her first novel in a decade, imagines what might have happened if a powerful cabal of wealthy, white, Republican men, horrified by the thought of a Black man in the White House conspired to undo the 2008 election of Barack Obama and restore America to their nostalgic view of the way things used to be. It is a strange, scary, often very funny mashup of political thriller and family melodrama, although at nearly 400 pages, it drags a little at the end.