Marie Besnard, the "Queen of Poisoners". Nanny Hazel Doss, killer of four husbands, three children, two sisters, and her mother--all to turn a profit. These are just two of the dozens of deadly and determined women who have been overlooked in the popular annals of serial crime--until now. More difficult to apprehend and motivated by more complex issues, female serial killers may be even more lethal and cunning than their male counterparts.