The second leg of their journey takes the McDonald family from Spring Green, Wisconsin, all the way to Washington, D.C. Some of their fun stops this time include a look at the world’s tallest man’s pants, Michael Jackson’s boyhood home, the world’s largest collection of outhouses, a Chicago Cubs baseball game, the Rock and Roll Hall of Fame, and (the best part) a day at the Cedar Point amusement park with awesome roller coasters. In between all of the sightseeing, somebody unknown keeps slipping them secret encoded messages. Now, while Coke has a photographic memory and is fast-thinking on his feet, Pep has real talent for deciphering codes. Each code is different, and some are harder than others, but Pep manages to figure them all out. Unfortunately, even after decoded, they don’t make much sense.
Another unfortunate situation is that somebody keeps trying to kill the twins. First it’s in a fake French fry museum where they are almost boiled in hot oil. Later, they’re nearly frozen in ice cream, and then they come close to having their heads explode with extremely loud music. Coke and Pep don’t know what to expect next, but it all boils down to July 3rd in Washington, D.C., according to one of the encoded messages. And then comes their aunt’s wedding, the original purpose of the trip, and the huge surprise that awaits them.
Racing across America, the twins will nearly be BOILED ALIVE in a huge basket of french fries, FROZEN TO DEATH by soft-serve ice cream, STAMPEDED in a wild stadium riot, KIDNAPPED from a high-speed roller coaster, and WORST OF ALL their parents think they're totally joking!
Will they survive? Will they defeat Archie Clone? Will they be dropped out of a helicopter onto the tip of the Washington Monument? Will they ever say "genius"?