The opera is "Siegfried", part of "The Ring of the Nibelung" by Wagner. The mystery woman attends only the second half, leaving Nye the tune for young Siegfried marked on a copy of the program, a motif for what she is doing. He attends an embassy party, given by the American ambassador and his wife, Sam and Mildred Cortman. Mary Ann is there, under her real name, Countess Renata Zerkowski. She offers Nye a ride home, but takes him instead to the home of Mr Robinson the financier, where they meet Colonel Pikeaway, Lord Altamount, James Kleek and Horsham. Nye is not seen for a while, as he has been accepted by the close-knit group of British intelligence to aid in accomplishing the tasks Mary Ann has taken on. They travel extensively. Mary Ann warns Nye that one among their own group is probably a traitor.