The Kids are enjoying a deep sea diving vacation when they are called in to see Mr. Socrates. He tells them they are wanted on a mission, they must go to Paris on a 'gig', but they have to ride the Orient Express there and pick up a super secret formula, which enemy agents are trying to get their hands on. Once they leave the janitor arrives, but it turns out he's a fellow spy sent to hack into Mr. Socrates and get the information about who will get the formula. He radios the info to his fellow agents who are disguised as passengers on the train. The Kids finally get the formula, disgused as a menu and take it into their car on the train. As they're taking pictures of it, one of the passengers disguses himself as an old woman and drives Butch and Merilee from the car by telling them there's a stange man in his compartment, but it turns out HE'S the strange man after his wig blow off. Wally chases him while Steffy guards the formula, but another agent threatens her and she tells him she