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When the mysterious Mr. Kingsley comes to their home town of Ivy, Illinois, on government business, the Thorne twins are convinced that he has something to do with UFO's.

Eric and Alison's Christian values help them when they become entangled in a civil war, the focal point of which is an undeciphered ancient inscription on an island in the Aegean Sea.

When sixteen-year-olds Eric and Alison discover a secret Nazi organization at the university in their home town, Eric, prompted by his Christian values, decides to infiltrate.

The Thorne twins search for a buried treasure stolen from their ancestors, but the ghost of a pirate emerges from the shadows to protect his treasure.

Alison Thorne's friend Lisa inherits an estate in England, but along with her inheritance comes an old family curse that puts her in danger.

At the summer Olympic games, Eric and Alison become involved in a plot against the United States government by foreign spies.

When the twins' plane goes down in the wilderness of western Canada, their struggle to safety is interrupted by three unfriendly people and warnings about a legendary monster of the Northwest. As always, their Christian faith serves them well.

Two young Christians look for a way to outwit terrorists who have seized control of the Alcola building, an ultramodern structure run by computers, during the grand opening ceremonies.

Searching for a rare art form on the Isle of Skye in Scotland, sixteen-year-old Alison and her twin, prompted by their Christian values, uncover a plot involving espionage and revenge.