Savannah Guthrie issued an urgent plea just hours before the latest development in the case of her missing mum, Nancy Guthrie. The 84-year-old was last seen on January 31 before police launched a missing persons case a day later. Now, a person has been detained hours after surveillance footage was released showing a masked figure on the elderly lady's doorstep on the day of her disappearance. A home is being searched in Rio Roco, Arizona, in connection with the case. However, the mother-in-law