The baffling disappearance of Nancy Guthrie has captivated America.

The 84-year-old mother of television journalist Savannah Guthrie disappeared from her Arizona home earlier this month in what police believe was a targeted kidnapping. Nearly three weeks on, despite emotional public appeals from her family, puzzling ransom notes, and an army of online sleuths, authorities appear to be at a loss. What makes this case so different from the countless missing-persons investigations that come and go? And who is behind Mrs Guthrie’s disappearance – and what do they want?

Host: Tessa Fleming Guests: Terry Sheridan, John Pistole