This is definitely a strange read, but in a good way. There are plenty of twists and turns to keep it interesting until the very end. The title makes you wonder is the author referring to Valentina and Julia or Elspeth and Edie; both are twins and their lives seem to mirror one anothers. Is the idea of being a "mirror" twin the fearful symmetry? Having read the book I still cannot say for certain but I can definitely recommend this book.