In Desert and Wilderness by Władysław Ślesicki

7.47

Fourteen year old Polish boy Stas Tarkowski and eight year old Nel Rawlison from England are kidnapped as the hostages by Arabic fanatics and taken to their religion leader. Then they manage to escape and try to return to their fathers. Children have a lot of dangerous adventures, meet two Black kids; Kali and Mea, who also help them, make a friendship with an elephant and help one Black's tribe.