A thorough study of the subject matter. Not necessarily one story but several cases and in depth research of these particular type of killers: women, who the way I see it have as much right to kill as anybody else and they certainly exercise that right to some extreme and disturbing point. Whoever thought that women are nicer than men they probably never met the killing type. I don't really care about the sex, even though I would respect a woman killing for her survival (as well as any man) but these subjects are way out there. Interesting at times, informative but not a one crime tale. Perhaps the academic type would find it more rewarding specially those on the field of criminology.