The world as we know it is ending. Evolution has reversed itself, affecting every living creature on earth. Science cannot stop the world from running backwards, as woman after woman gives birth to infants that appear to be primitive species of humans. Thirty-two-year-old Cedar Hawk Songmaker is four months pregnant. Though she wants to tell the adoptive parents who raised her from infancy, Cedar first feels compelled to find her birth mother, an Ojibwe living on the reservation, to understand both her and her baby’s origins. As she goes back to her own biological beginnings, society around her begins to disintegrate. It will take all Cedar has to avoid the prying eyes of potential informants and keep her baby safe.