The Time Warp Wonder

"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. But not everyone is as prepared for the big fair. Their good friend Phil has designed a time machine he calls the Time Warp Wonder. He just needs to figure out how it works first... Phil uses Chet's hamster as a test subject. And the machine really does make the hamster disappear from the cafeteria! Frank and Joe are not so sure the hamster went back in time. They have a feeling their Clue Book will be more help to Chet's hamster than Phil's calculations. But the brothers start questioning their instincts when they receive pictures of the hamster in different time periods; dressed as caveman with the dinosaurs, suited up in armor in the middle ages, in a top hat watching Abe Lincoln give a speech. Could Chet's hamster really be traveling though time?"--