When Vi and Amos go diving for the first time in the West Indies, they hope to explore the recent wreck of a smuggling ship. Once underwater, Vi struggles to remember who the man up on the surface, pumping air down to their diving suits, reminds her of. Suddenly she realizes. He is Nana's son! Nana, the housekeeper who Amos sacked for stealing. And Nana's son had vowed to get even with them.
Vi searches frantically among the coral for Amos and struggles to make him understand what has happened. But every time she tries to scream, she senses the lack of air in her diving helmet....