The X-Factor by Franklin W. Dixon is a young-adult crime/detective-mystery novel. Originally released in 2009, it is the 3rd book in the Galaxy X Trilogy story arc, which is listed as 30th book in The Hardy Boys: Undercover Brothers series. The series follow the thrilling adventures and missions of Frank and Joe Hardy, teenage detective brothers.
The book is preceded by X-Plosion (Book 29) and followed by Killer Mission (Book 31).
You can find the other books in The Hardy Boys: Undercover Brothers here.
- Title: The X-Factor (Hardy Boys: Undercover Brothers 30)
- Author: Franklin W. Dixon
- Publisher: Aladdin
- Date Published: September 8, 2009
- Language: English
- ISBN-10: 141697802X
- ISBN-13: 9781416978022
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