In search of hidden diamonds, Claire returns to the German countrysideAt the height of World War II, Iris is a young Jewish girl living in Munich. One night she returns home to find her family has disappeared. With her uncle Oswald, Iris buries the family diamonds at Saint Hildegard's Mill before escaping to the United States, where she lives quietly for five decades. She will never return to look for her diamonds, but she has a friend who will.When an old friend invites Claire Breslinsky to a wedding at Saint Hildegard's Mill, Claire demurs — until Iris tells her about the hidden fortune that awaits her. Claire makes plans to attend the wedding to take some pictures, and do some light treasure hunting. But she will end up investigating a murder instead.