Made for a general audience, the film provides a clear and concise presentation on technological developments that began with the vacuum tube, showing different types of transistors and explaining the significance in their ultimate replacement of tubes.
In the spring of 1945, World War II is coming to a close. Roger Halyard, a dignified, strait-laced Englishmen, lives on a South Sea atoll with his three daughters, Gloria, Hester and Violet, along with the housekeeper, Thelma, who has raised the girls since childhood.
The new steward of Siltala ends up falling in love with the beautiful widow of the house. Their romance is endangered by misunderstandings and the fact that the estate of Siltala is swimming in debt.
A jeweller is killed in a gang robbery leaving the daughter as the only witness. When the police can't build a case against him she decides to go undercover to infiltrate the home of the killer's brother.