Tarzan the Terrible by Edgar Rice Burroughs

It was a baffled gryf that bellowed in angry rage as Tarzan's sleek brown body cutting the moonlit waters shot through the aperture in the wall of the gryf pool and out into the lake beyond. The ape-man smiled as he thought of the comparative ease with which he had defeated the purpose of the high priest but his face clouded again at the ensuing remembrance of the grave danger that threatened his mate. His sole object now must be to return as quickly as he might to the chamber where he had last seen her on the third floor of the Temple of the Gryf, but how he was to find his way again into the temple grounds was a question not easy of solution.

In the moonlight he could see the sheer cliff rising from the water for a great distance along the shore -- far beyond the precincts of the temple and the palace -- towering high above him, a seemingly impregnable barrier against his return. Swimming close in, he skirted the wall searching diligently for some foothold, however slight, upon its smooth, forbidding surface. Above him and quite out of reach were numerous apertures, but there were no means at hand by which he could reach them. Presently, however, his hopes were raised by the sight of an opening level with the surface of the water. It lay just ahead and a few strokes brought him to it -- cautious strokes that brought forth no sound from the yielding waters. At the nearer side of the opening he stopped and reconnoitered. There was no one in sight. Carefully he raised his body to the threshold of the entranceway, his smooth brown hide glistening in the moonlight as it shed the water in tiny sparkling rivulets.