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.
Inspan is dedicated to tough pioneers, who along dangerous roads - with courage and strength - developed the vital transport routes for a young and growing country - the transport riders.
On an African safari with his friend Grant, Clyde Beatty plans to buy some black-maned Numbian lions from Jo Carter but her animals are wiped out by a fire.
A sheep rancher entrusts his goofy sheepdog Dizzy to guard his herd one night. The dog is told to blow a whistle when he sees a wolf, but he spends his time fooling his master by "crying wolf," and he proceeds to blow the whistle for no reason other than to excite the farmer.
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.