Absolutely riveting!! I was completely hooked from the first chapter and eager to read on. I really liked the shifting time periods which helped to move the story along at an absorbing pace that left me wanting to know what was going to happen next. I found the relationship and physical differences between the twin sisters really unique and avoided falling in to usual overused and stereotypical traits. This was a brilliant way of setting the story and giving the reader an insight in to what happened in the lives of these two women which lead them to their present situations. I was absorbed by Robin and Sarah and eager to find out more, I couldn't put this book down and really didn't want to close my eyes.