"Geoffrey Lushington, Mayor of Marlow, dies suddenly during a town council meeting. When traces of aconite--also known as the queen of poisons--are found in his coffee cup, the police realize he was murdered. But who did it? And why? The police bring Judith, Suzie, and Becks in to investigate the murder as civilian advisors right from the start, so they have free rein to interview suspects and follow the evidence to their heart's content... which...