Investigators hunting for missing 84‑year‑old Nancy Guthrie in Arizona are poring over a series of ransom notes whose hidden linguistic 'fingerprint' could reveal which messages are genuine and who is really behind them, according to former FBI specialists.
Nearly five months into the case, experts are focusing on the 'fingerprint' to determine which messages are genuine and which are the work of opportunistic hoaxers. This FBI investigation has become a race against time, with the ransom notes now serving as the task force's primary source of intelligence.
