Helen Winston

Marge, a young flight attendant, is offered the chance to work a chartered flight her boyfriend Bill is piloting. On the trip are four members of a company engaged in the manufacturing of various plastics - Messrs. Arnold, Duncan, Harmon, and Casey. Mr. Arnold engages Marge in conversation about many of the ways plastics are used in modern life. Then Mr. Duncan tells her about more uses of plastics. Then Mr. Casey tells her about further uses of plastics.

A 17th-century Caribbean port rumored to have frequented by pirates rises from the ocean floor, where it came to rest after an earthquake many years before. A scientist wants to study it, some thugs want the treasure alleged to be stored there, a bunch of mutated giant crabs living there attack them all.