The Marines desperately want to build a landing strip on strategically located Halfway Island, but a mysterious villain calling himself the Tiger Shark has thwarted them every step of the way. Who is the Tiger Shark? How does the Tiger Shark make any airplane that approaches Halfway Island crash into the sea? The Marines put the matter into the hands of Cpl. Larry Lawrence and Sgt. Mack McGowan, who track the Tiger Shark through 12 chapters of action and suspense. Includes the original theatrical trailer.