I first read Mr. Kurth's book upon its release twenty-plus years ago. I was absolutely fascinated by the story, and although I was already generally interested in the Romanovs, "Anastasia: The Riddle of Anna Anderson" is one of the two books (the other being Massie's) which I recall being instrumental in my developing my"passion" for Romanov and Russian history.
It remains a staple in my Russian history "sub-library" (although it is now dog-eared and worn, but I've always believed that indicates a well-used, well-loved and treasured book). Like Elisabeth, I've read it as from both "believer" (when I first read the book it made a believer of me) and "nonbeliever" points of view. While I am now firmly and irrevocably in the camp that believes all the members of the Imperial Family in the Ipatiev House died that night in 1918, I highly recommend this book as required reading.
Jane