Harry T, many thanks for introducing me to this book, which I've just finished reading. It started a bit slow, but the second half was a real page-turner. I never guessed the dénouement.
But did you notice the glaring discrepancies in the dates? If the guys had no contact with the civilised world since March 1865, how could they know about ..... but I'll say no more so as not to spoil the very surprising ending.
A really good book. Thanks for your time in preparing and uploading it.