When her nurseryman father's favorite new flower, Blue Mystery, disappears, Annegret determines to find it and the person who took it. Solving the mystery takes her beyond the security and comfort of her home out into the German town where she lives. Here, for the first time, she sees and understands that others do not have her privilege. Annegret's moral dilemmas give substance to the charm of this mystery that, at the time of its publication, showed Germans, so recently enemies of the United States, as human beings.