ip in history continues! In this fourth book in the thrilling, New York Times bestselling adventure series, twelve-year-old twins Coke and Pepsi McDonald discover that everything really is bigger in Texas--including the danger!

After their explosive escape at Graceland, twins Coke and Pepsi are ready to resume their trip across America--only now in a convertible instead of the RV. They travel through Arkansas and Oklahoma, visiting weird-but-true tourist stops along the way, and finally end up in Texas, home of the Weird Capital of the Country, Austin. The twins' many enemies--the bowler dudes, Mrs. Higgins, and Dr. Warsaw--all swear that they're done chasing Coke and Pepsi for good. But when the twins start receiving more codes and ciphers from a mysterious robotic voice, they know someone's after them. They just have to figure out who before the mystery villain finds them first.

With Dan Gutman's laugh-out-loud humor and featuring photos and weird-but-true American tourist destinations like the Museum of Weird, The Genius Files is a one-of-a-kind mix of geography and fun.

Don't miss the next action-packed book, The Genius Files #5: License to Thrill!