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The Ultra-Thriller series is a detective/action fiction series published between August 1992 and June 1993 by Archway Paperbacks (an imprint of Simon & Schuster). It was a spin-off of The Hardy Boys Casefiles and the Tom Swift IV series and joined boy inventor Tom Swift with the crime solving Hardy boys, Frank & Joe. Although The Hardy Boys pseudonym, Franklin W. Dixon was used, this series was more akin to the Tom Swift IV series by Victor Appleton.

• Alien Factor
• Time Bomb

• Tom Swift and His Electronic Web
• The Hardy Boys Encyclopedia

This article about a young adult novel of the 1990s is a stub. You can help Wikipedia by expanding it. See guidelines for writing about novels. Further suggestions might be found on the article's talk page.

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This article about a mystery novel for children first published in the 1990s is a stub. You can help Wikipedia by expanding it. See guidelines for writing about novels. Further suggestions might be found on the article's talk page.

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