Jungle Jim #13 (1949)

"Mystery Island," written and drawn by Paul Norris, follows Jungle Jim as he searches for his missing houseboy and discovers a plot involving native cormorants and fishermen on a mysterious island. When Jim's friend Kolu goes missing and natives vanish, Swinford provides Jim with a motorboat to investigate. Jim battles fishermen and rescues a woman named Bella from the villains' clutches, ultimately triumphing in hand-to-hand combat against Swinford and his crew.