The Double Danger Trilogy is a three-part mini series in the The Hardy Boys Undercover Brothers series. The first book in the series, Double Trouble was published on November 25, 2008 (only two months after the conclusion of the Murder House Trilogy) with book two, Double Down, published on January 6, 2009 and three, Double Deception, published in early March.
- Teen superstar Justin Carraway is being stalked, and Frank and Joe must figure out who is the culprit. But the case only gets more complicated after they meet Justin's twin brother, Ryan.
- Frank and Joe uncover new surprises about Justin, the teen celebrity they've been assigned to protect, while desperately searching for Justin's missing twin brother, Ryan. The action heats up when Justin starts acting suspicious.
- The action heats up in the Double Danger trilogy when Justin, the teen celebrity Joe and Frank have been assigned to protect, starts acting suspicious, leading to a shocking twist conclusion.
|The Hardy Boys Trilogies|
|Bayport Corruption • Operation Phoenix • Ring of Evil • Murder House • Double Danger • Galaxy X • Killer Mystery • Lost Mystery|
|Bayport Corruption titles||See No Evil • Line of Fire • Beyond the Law|
|Operation Phoenix titles||Endangered Species • No Mercy • The Phoenix Equation|
|Ring of Evil titles||Tagged for Terror • Survival Run • The Pacific Conspiracy|
|Murder House titles||Deprivation House • House Arrest • Murder House|
|Double Danger titles||Double Trouble • Double Down • Double Deception|
|Galaxy X titles||Galaxy X • X-plosion • The X-Factor|
|Killer Mystery titles||Killer Mission • Private Killer • Killer Connections|
|Lost Mystery titles||Children of the Lost • Lost Brother • TBA|