The spinster Lucrezia, last of the notorious Borgia clan, who used poison as a favorite means of murder, is in prison. Lupin and company, asked by her nephew Caldan to spring her, get themselves arrested and thrown in jail, and free her, bed and all. But Galdan was actually after Lucrezia's life, and getting her out was so that he could make her confess where the clan's jewels have been hidden. With the Old Man strangely mixed in, what will be the resolution?