It's fiction. Here's the synopsis from her site: Spanning 19th century London and 21st century Los Angeles, SOUL links the lives of two women and the dangerous paths they choose. Professor Julia Huntington studies a rare breed of soldier who can kill without remorse. She fears that the answer to whether a killer is born or made lies in our genes. Does she too share this gene? And how far will she go if pushed hard enough?
Lavinia is Julia's great grandmother. As a young bride in Victorian London who is obsessively in love with her husband, she is pushed towards madness as her husband's true sexuality reveals itself. The fates of two women, two hundred years apart, are written in their genes as their stories hurtle towards a frightening conclusion.