Asked to accompany Mrs. Roosevelt on her Pacific Island tour, Agnes and Katherine travel by train to Washington, D.C. Agnes carries a package for Colonel Farthingworth to President Roosevelt. Convinced the package contains secret war documents, Agnes expects Nazi spies to try and derail her mission. She meets Irving, whose wife mysteriously disappears from the train; Nanny, the unfeeling caregiver to little Madeline; two soldiers bound for training as Tuskegee airmen; and Charles, the shell-shocked veteran, who lends an unexpected helping hand. Who will Agnes trust? Who is the Nazi spy? When enemy forces make a final attempt to steal the package in Washington, D.C., Agnes must accept her own vulnerability as a warrior on the home front. Can Agnes overcome multiple obstacles, deliver the package to the President, and still meet Mrs. Roosevelt's plane before she leaves for the Pacific Islands? Mrs. Odboddy: Undercover Courier is a hysterical frolic on a train across the United States during WWII, as Agnes embarks on this critical mission.