I've just finished it, and thought it was a wonderful book! I had also just read "The Secret Letters of the Last Tsar" (Nicholas & Marie Feodorovna's correspondence). In it there was a passage:
"Peter was in Paris for two days for the funeral service of poor Yuri and said that the French were very poliite and courteous. It is so sad that his poor children, Sergei and Ileana, only arrived two hours after his death."
There was no reference as to whom Yuri was, although most other people mentioned in the letters were identified. My guess is the editor (Edward J. Bing) didn't know whom it was. Although I figured out Peter was Olga's husband (of Oldenburg) from the context, it was only after reading Zoia's wonderful book that I was able to connect the Yuri to Georgy, the 6th Duke of Leuchtenberg! Who would know that the family called him Yuri! Thank you Zoia!
I think this book is a must have for those interested in the Romanovs. The ongoing connection of the Leuchtenbergs with the Romanovs is fascinating and convoluted. Zoia's book helps clarify many of the connections ( or should I say hook-ups) between the two families.
BobG