" My friend Emma, who likes things to add up neatly, claims that this is because my parents died when I was too young to take it in: they were there one day and gone the next, crashing through that fence so hard and fast they left it splintered for good. When I was Lexie Madison for eight months she turned into a real person to me, a sister I lost or left behind on the way; a shadow somewhere inside me, like the shadows of vanishing twins that show up on people's X-rays once in a blue moon. Even before she came back to find me I knew I owed her something, for being the one who lived. "

― Tana French , The Likeness (Dublin Murder Squad, #2)