Having trouble with their geography knowledge, A.J. and his friends go to get help from Mr. Cooper, but he sends them to Mrs. Barr. Mrs. Barr knows seven languages and has traveled to more than 200 countries, but she is also very strange--she never enters a room without opening the window, and she always has a suitcase packed and ready to go. A.J. and his friends think she must be hiding something, and so they investigate.