Tarzans Desert Mystery 1943 A letter from Jane, who is nursing British troops, asks Tarzans help in obtaining a malaria serum extractable from jungle plants Tarzan and Boy set out across the desert looking for the plants and wind up ruining a Germans attempt to capture a wild horse They arrive in an Arab city and rescue a stranded American lady magician, sentenced to be hanged for carrying a secret message to the Sheik To obtain the plants, Tarzan must fight prehistoric monsters, Nazis, and so on