I like it when authors utilize bits of poetry as titles, provided that they are meaningful to the substance of the book. Taken from William Blake's "Tyger, Tyger," the symmetry in Niffenegger's title refers to identical twins, and the fearful secrets that are hidden in their relationships. I like it when a book's title makes me think about what it actually means. I loved that this book was set in Highgate Cemetery, that it has a ghost, and that it's brimming with Gothic atmosphere. I know some people were disappointed because it was not The Time Traveller's Wife, but I've not read it, and I had no reason to be disappointed. I loved it.