I continue in presenting my views on the imperial family and those around them.
From my research, nothing allows me to say that Sophie Buxhoeveden betrayed the imperial family. At least, no more than other relatives. I think for example of Lili Dehn. When I read Markov's book, it seemed rather strange to me. Moreover, unlike Mrs. Viroubova, the imperial family often says they have no news of Lili Dehn in exile.
But I will not say that Lili Dehn has betrayed the imperial family. Such an accusation requires more than a strange attitude in a book, even if it is written by a witness.
For the rest, I think that Markov (the officer, not the politician who betrayed the imperial family) was a very honest man in his intentions to free the imperial family, and yet he was unknowingly involved in a plot. I stress that he, too, has known Bolshevik prisons. He admits to having worked for them to be released. Yet, in parallel, he continued to work for the imperial family.
Reading the writings of Sophie Buxhoeveden she appears as a clever, resourceful woman. She was cunning to reach the imperial family, but to betray me seems very surprising.
I will conclude by saying that it is an interesting ambition to want to reverse the "romantic and ideal myth of the Romanovs", but we need tangible elements. However, for the moment, judging tangible evidence, there are some crumbs on one side and a documentary mass on the other.