'A sordid tale of lesbian sex, murder and seduction in a Catholic convent in 19th-century Rome has been discovered in a secret Vatican archive. The Sant'Ambrogio scandal involves a beautiful young sister who convinced the nuns she was experiencing visions and visits from heaven - then made them engage in rampant sexual activity. Herbert Wolf, a leading scholar of the Catholic Church, learned of the Sant'Ambrogio scandal when he became one of the first allowed into the archives of the Congregation for the Doctrine of the Faith. The naughty nun also entered into an erotic relationship with a theologian on...