Mary-Kate and Ashley Parker (Mary-Kate and Ashley Olsen) are taken into the FBI Witness Protection Program after they observe a notorious gangster's theft of the Kneel Diamond. Unfortunately, the girls are uncontrollable blabbermouths, and they blow their cover in town after town until there's only one hiding place left--Australia. Hiding out in Sydney, the girls face bigger challenges than keeping their identity a secret, such as fitting in with the popular group, learning Aussie lingo, and, ultimately, having to thwart the bad guys. But along the way, they manage to have some fun in the sun with some cute boyfriends!