 In a 2003 book talk at the Library of Congress, Elizabeth Peters revealed that her overall plan was to continue the series chronologically through World War I and end with the events surrounding the discovery of the tomb of Tutankhamun in 1922, as the aging of the characters in real time presented a challenge to extending the series further.Although her age is only given in the first book, Amelia Peabody would have been seventy years old—and Emerson 67 or 68—by that point in history, making their often physically trying acts of heroism less and less credible.This stated goal was accomplished with the publication of "Tomb of the Golden Bird" in 2006.