On an ice-bound, snow-covered island, Frank and Joe attempt to solve the mystery of a boy's disappearance and the theft of a priceless collection of antique medals.

In Austria to watch a mutual friend participate in an ice skating competition, the Hardy brothers and Nancy Drew find themselves involved in a dangerous international adventure when their friend is kidnapped after winning a gold medal. The reader's choices determine the outcome of the plot.

Nancy Drew and the Hardy brothers run into danger when they try to prevent the sabotage of an anti-pollution campaign. The reader controls the outcome of the story by choosing different ways of advancing the plot.

When Joe's girlfriend Iola is killed in the blast of a terrorist bomb, Frank and Joe Hardy pursue a ruthless terrorist leader, the infamous Al-Rousasa, who has targeted a presidential candidate for assassination.

While on a relaxing safari vacation to Nairobi, Frank and Joe Hardy become involved in finding the culprits responsible for killing innocent animals for their tusks and skins.