Whiz and Joey involve the Tanner-Dent Detective Agency in a bid to settle a bet. Is there a time-traveling DeLorean sitting in Farmer Zimmer's old barn? But, it's not so easy to find out--the barn sits in the middle of a BULL pasture! Our heroes learn quickly that bulls are the least of their worries, as this simple task gets them trapped in a secret tunnel and eyeball deep in a mystery involving an abandoned US Air Force Radar Station and stolen military Top Secrets.