FRANKFURT An eclectic range of topics will be in focus at the world's biggest book fair this week, from a row over an Italian mafia author to growing interest in wacky literary subgenres and AI in publishing. The Frankfurt book fair, which officially kicks off today, brings together authors, publishers and other industry players over five days in the western German city. Names include Israeli author and historian Yuval Noah Harari, best known for "Sapiens: A Brief History of Humankind,"