Anna Virubova, a friend of Empress Alexandrovna's, supposedly wrote secret notes in French that were smuggled in (by nuns?). The notes asked for the Tsar to draw a map of the Ipatiev House and asked his advice for a secret escape in the middle of the night. Nicholas responded saying that he could only be rescued by force. The imperial family and their attendants (Dr. Botkin, Demidova, Trupp, Kharitonov) anxiously waited every night, fully clothed and ready to move quickly. Whether these notes were legitimate or orchestrated by the Bolsheviks is debatable. I reccomend The Kitchen Boy by Robert Alexander.
What I'll do is quote various books where the "The Mysterious Letters" are mentioned.
p. 512 Robert Massie's NICHOLAS AND ALEXANDRA:
>>Preston new nothing of attempts to resuce the Tsar, and Bykov found plots sesething on every corner.<<
Thomas H Preston was the British Consul in Ekaterinburg.
P. M. Bykov was the Chairman of theEkaterinburg Soviets.
The report of the letters are found in General M. K. Dieterichs [Diterikhs], Chief-of-Staff of Admiral Kolchak's White Army, who was very much a part of the investigation into the disapearance of Nicholas II and the others.
>>..The first letter was a message from an anonymous White offier to the Tsar:
"With God's help and your prudence we hope to achieve our object without running any risk. It is necessary to unfasten one of your widnows, so that you cn open it; please let me know exactly which. If the little Tsarevich cannot walk, matters will be very compliced, but we have weighed this up too, and I do not consider it an insurmountable obstacle. Let us know definitely wheter you need two men to carry him and whether any of you could undertake this work. Could not the little one be put to sleep for an hour or two with some drug? Let the doctor decide, only you must know the time exactly, beforehand. We will supply all that is necessary. Be sure that we shall unerstake nothing unless we are absolutely certain of success beforehand. We give you our solemn pledge of this before God, history and our own conscience." The letter was signed; "Officer."<<
p. 513 Massie's book continued:
>>The second letter quoted by Dieterichs is Nicholas's reply:
"The second wndow from the corner, looking out onto the square, has been kept open for two days already, even at night. The seveth and eight windows near the main entrances... are likewise kept open. The room is occupied by commandant and his assistants who constitue the inner guard at the present time. they number thirteen, armed with rifles, revolvers and grenades. No room but our has keys. The commandant and their assistants can enter our quarters whenever they please. The orderly officer makes the round of the house twice an hour at night and we hear his arms clattering under our windows. One machine gun stands on the balcony and one above it, for an emergency. Opposite our windows on the other side of the street is the [outside] guard in a little house. It consists of fity men... In any case, inform us when there is a chance and let us know whether we can take our people [servants]... From every post there is a bell to the commandant and a signal to the guard room and other places. If our people stay behind, can we be certain that nothing will happen to them?"
Nicholas II's diary
June 27
>>We spent an anxious night, and kept up our spirits, fullly dressed. All this was because a few days ago we received two letters, one after the other, in which we were told to get ready to be rescued by some devoted people, but days passed and nothing happened and the waiting and the uncertainty were very painful.<<
Quote p.513 Robert Massie's NICHOLAS AND ALEXANDRA.
LIFE ONG PASSION, NICHOLAS AND ALXANDRA THEIR OWN STORY collected by Maylunas and Mironenko tell us that on 14/27 June 1918 that Nicholas wrote the following in his diary:
>>Our dear Maria is 19 years old. The weather was still as tropical, 26 degrees in the shade and 24 in the rooms, almost impossible to bear! We spent and anxious night and stayed awake fully dresssed. This was because, a few days ago, we received two letters one after the other, which informed us that we shold prepare to be rescued by some people devoted to us! But the days passed and nothing happened, only the waiting and the uncertainty were torture.<<
LIFE ONG PASSION, NICHOLAS AND ALEXANDRA THEIR OWN STORY collected by Maylunas and Mironenko tell us that on 15/28 June 1918 what Alexandra wrote:
>>..[in part]...we hear the night sentry under our rooms being told quite particularly to watch every movement at our window -- they have become again most suspeicious, since our window is opened & don't all one to sit on the sill even now.<<