Tarzan and the Jewels of Opar by Edgar Rice Burroughs

After Werper had arranged the dummy in his bed, and sneaked out into the darkness of the village beneath the rear wall of his tent, he had gone directly to the hut in which Jane Clayton was held captive.

Before the doorway squatted a black sentry. Werper approached him boldly, spoke a few words in his ear, handed him a package of tobacco, and passed into the hut. The black grinned and winked as the European disappeared within the darkness of the interior.