Double Down by Franklin W. Dixon is a young-adult crime/detective-mystery novel. Originally released in 200#, it is the 2nd book in the Double Danger Trilogy story arc, which is listed as 26th 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 Double Trouble (Book 25) and followed by Double Deception (Book 27).
You can find the other books in The Hardy Boys: Undercover Brothers here.

- Title: Double Down (Hardy Boys: Undercover Brothers 26)
- Author: Franklin W. Dixon
- Publisher: Aladdin
- Date Published: December 23, 2008
- Language: English
- ISBN-10: 1416974466
- ISBN-13: 9781416974468
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