Lara Croft, the fiercely independent daughter of a missing adventurer, must push herself beyond her limits when she finds herself on the island where her father disappeared.

The physician's death orphans his two adolescent daughters. Their older brother is able to convert some of the doctor's small estate to cash. But it is late in the day, and with the banks closed he stores the money in his father's household safe. The slatternly housekeeper, aware of the money, enlists a criminal acquaintance to crack the safe. She attempts to get into the adjacent room where the sisters tremble in fear, but finds that the door is locked. The drunken housekeeper menaces them by brandishing a gun through a hole in the wall.

Jean Evans of an international wildlife foundation, who is known to Africa as 'the Panther Girl' because of her bravery in jungle living, stumbles on a plot by a mad scientist to frighten the natives out of a diamond-laden district by chemically growing crayfish to giant size, and enlists the aid of a game hunter friend to prevent a monster rampage and bring the culprits to justice.

Lally is a rich girl whose father writes books and plays polo. After 23 years of marriage her father decides to divorce Lally's mother and remarry to soon-to-be-divorced Beth Cheever. This sours Lally on all men. While on vacation with her mother she meets Jack, who succeeds in stealing her heart. Then Lally discovers that Jack is the son of Beth Cheever, the woman who is to marry her father.