Steve and Kate are charged with kidnapping a young man they had given a ride on the Westwind. The Andrews unknowingly take an extortionist on board.

Tom and Robin get involved with an adventure concerning a treasure map.

Robin is hospitalized after being bitten by a water snake. Robin is bitten and hospitalized after she and Tom ignore warnings of water snakes in their diving area. 

Tom and Robin help a park ranger investigate reports of ghosts frightening visitors.

Tom comes to the aid of an old fisherman accused of stealing fishing nets.

A woman asks the Andrews family for help in searching for her husband, who supposedly dived into the ocean and never came back up.

An elderly Hawiaan man attempts to get Tom and Robin to help him make a dive into a lagoon containing a shark that is considered to be a god.

Modern-day pirates steal the ketch with Steve and Kate aboard.

An elderly man (John Carradine) involves the Andrews family in his search for stolen jade.

Tom and Robin search for a mythical creature who can kill through will power alone.

A cripple, who blames Steve for his problems, kidnaps Robin in retaliation.

While out at sea, supplies begin to disappear off of the Westwind.

Outlaws force the Andrews family to dive for sunken treasure in an area with a killer shark.