Extreme Danger by Franklin W Dixon is a young adult crime-mystery novel. Originally released in 2005, it is the 1st 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 followed by Running On Fumes (Book 2).
You can find the other books in The Hardy Boys: Undercover Brothers here.

- Title: Extreme Danger (Hardy Boys: Undercover Brothers 1)
- Author: Franklin W. Dixon
- Publisher: Aladdin
- Date Published: June 1, 2005
- Language: English
- ISBN-10: 1416900020
- ISBN-13: 9781416900023
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