Book excerpt: Investigative reporter Wensley Clarkson has spent years researching the most extreme and intriguing cases of women who commit murder, and this gripping collection brings together 20 of his most thrilling true stories. These are the tales of women who challenge our idea of what many still, mistakenly, often think of as the weaker sex. Their characters and backgrounds are as diverse as they are deadly, and their crimes are every bit as shocking as those of of their male counterparts. From the case of the beautiful Diana Perry, who suffered years of abuse at the hands of her husband before taking the matter into her own hands; to Bobby, a woman whose gruesome interest in blood led to one of the most horrific seduction killings ever seen.