The X Factor
House name Franklin W. Dixon
Publication information
Publisher Simon & Schuster
Publication date 2009
Media type Print (paperback)
Series Galaxy X Trilogy
The Hardy Boys Undercover Brothers
Preceded by X-plosion
Followed by Killer Mission
External links
The Hardy Boys Encyclopedia


The X Factor is the final book in the Galaxy X Trilogy and 30th overall in The Hardy Boys Undercover Brothers series. It was published in September 2009 by Simon & Schuster.

Back cover summary

ATAC BRIEFING FOR AGENTS FRANK AND JOE HARDY. MISSION: To find out who is responsible for Bret Johnston's death, and save Galaxy X from another tragedy.

LOCATION: Galaxy X, a new theme park in California.

;;POTENTIAL VICTIMS: Any number of A-list celebs invited to the grand opening of the park.

SUSPECTS':' Tyrone McKenzie and his family seem to make enemies by the second. But is it a new enemy that wants to keep the park shut down? Or someone from the McKenzie family's past who has suddenly resurfaced...?

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Plot summary

to be added.


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Galaxy X

Businesses and organizations


External links

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