After being put on indefinite leave by his chief of police uncle, the highly intelligent and arrogant huntsman spider Inspector Sun boards a San Francisco bound seaplane. Joined by an intrepid young fan, Sun is pulled into a murder case where the turnout could affect both the insect and human worlds.

A sea plane is destroyed in a freak accident, five people find themselves drifting on a raft. At the mercy of the tide and with no hope of rescue, the helpless situation takes a horrifying turn when they are terrorized by a ravenous great white.

A mercenary is hired by the FBI to track down a powerful recluse criminal, a woman is also trying to track him down for her own personal vendetta.

A schoolteacher and amateur sleuth suspects foul play when a fellow passenger on a seaplane gets sick and dies. The third and final film with Edna May Oliver and James Gleason as the astute schoolteacher Hildegarde Withers and the New York Police Inspector Oscar Piper busy solving crimes.

Upon graduation from high school eight teens take a seaplane trip, intending to celebrate on Keith's parents' private island. Stormy weather causes the plane to crash and they end up on a deserted isle. They find evidence of other visitors, and soon must fend for their lives against drug smugglers.