Nyoka the Jungle Girl #15

Nyoka and her companion Larry crash-land their plane in the jungle after discovering sabotage to the gasoline tank, forcing them to seek help from a nearby native village. They discover Professor Digges, who had been reported missing, hiding in a shack; he reveals that a man named Mace has been tormenting him and forcing him to write letters to his wife. After rescuing the Professor and battling Mace and his men at the village, Nyoka and Larry successfully capture the villain, and the Professor is safely reunited with his wife back in the United States.