A young army officer has been captured during the wars in Soudan, and is being held as a slave in the stronghold of the Mahdi. For years it had been thought that he was dead. His friends in London decide to go and try to rescue him. One of them is a well-known and proficient surgeon. They arrive in Cairo, and proceed on down into the Soudan, where they get in contact with an influential Sheikh. They establish themselves by doing many cures, where it is possible, and gradually work themselves nearer and nearer to the place where they estimate the missing Harry to be. Eventually they are able to make contact. Harry breaks his own arm in order to be brought to the surgeon, or Hakim, for a…
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