Never thought a book about a serial killer would make me laugh out loud. Very funny on occasion, although the humour is as dark as the subject matter. Much more interesting than the murders is the central relationship between the sisters, and the idea that the two depend on each other and gain from this dependency. The shared childhood and experiences has shaped the sisters, one becomes a healing nurse and one a killer. The novel raises the question of the extent to which nurture shapes us and the way we relate to the world. Neither sister is as good or bad as you initially think, and this is an intense message about how little you can know about someone. The novel is also a powerful consideration of the role of women and the part they play in society and the roles that are forced upon them. The women are forced to play supporting roles to men, leading to the reader having sympathy for the serial killer...