In the early summer of 1982, Roberto Calvi, chairman of Italy’s largest private bank, Banco Ambrosiano, vanished from the intricate world of European high finance. By then, Calvi was a man living on borrowed time and borrowed money, so entwined with the Vatican’s financial apparatus that journalists nicknamed him “God’s Banker”. Yet on 18 June 1982, London police found his lifeless body swinging beneath Blackfriars Bridge, pockets weighted with bricks and banknotes, a detail