Morse and Lewis investigate the death of Laura Poindexter, an American tourist who is part of an exclusive tour group visiting Oxford. Missing from her personal effects is her jewelry, including the Wolvercote Tongue which she was going to donate to the Ashmolean Museum. The pathologist determines that she died of natural causes, but Morse feels there&#39s something not quite right. The mystery deepens when Theodore Kemp, the Ashmolean&#39s expert on the Wolvercote Tongue, is found dead and Mrs. Poindexter&#39s husband goes missing.