Emanuela Orlandi, 15, was last seen in central Rome after leaving a music lesson on June 22, 1983. The case inspired a recent hit documentary series, Vatican Girl, which aired on Netflix.
One of the most popular theories is that the girl was kidnapped by mafiosi to pressure the Vatican to recover a loan. Others say she was abducted to force authorities to release Mehmet Ali Agca, the Turkish national who attempted to assassinate John Paul II in 1981.