Just before he dies, Marjorie Burke’s grandfather leaves her a message: “He’s coming for me. Then he’s coming for you.” In Stephanie Feldman’s “The Angel of Losses” (Ecco, $25.99), Marjorie must unravel this bizarre warning. But she’s also busy trying to complete her PhD research on the Wandering Jew and deal with her sister’s unexpected marriage to an Orthodox Jew who belongs to a mystical sect called the Berukhim Penitents.