In this film a party of men and women start in a long snub-nosed boat to make the descent of a torrent in the interior of Japan. The party leaves the limpid waters of a quiet pool, but soon swing out into the rushing torrent. Presently they approach a gorge through which the water roars fiercely. A narrow place between rocks is the only opening navigable. It seems that they must be instantly dashed to piece, but in a moment they find themselves out on the other side into smooth water again. Time and time again during the trip the party seems in imminent danger of complete destruction in the turbulent, seething, swirling waters which dash over the cruel rocks like some wild animal licking its lips in anticipation of feeding on its prey. After three hours of this perilous boating the party find themselves 1050 feet lower than the point from which they started and again safe on the wide, calm surface of a sort of lake.
—Moving Picture World synopsis