The Time Warp Wonder (Hardy Boys Clue Book Series #8)

Detective brothers Frank and Joe work to debunk a time travel machine in the eighth book in the interactive Hardy Boys Clue Book series.

Bayport Elementary is almost ready for the annual science fair-it's all down to the final touches. Frank and Joe have collaborated on a detective helmet. It's the perfect lie detector-just place it on a suspect's head and the bells and whistles will tell you when they're lying.

But not everyone is as prepared for the big fair. Their good friend Phil has des...