There is a convention planned for the girls at the school. It requires the okay from mother superior and the girls have to meet the required grades. Some of the girls are left behind. But not...

There is a convention planned for the girls at the school. It requires the okay from mother superior and the girls have to meet the required grades. Some of the girls are left behind. But not Marvel Ann, she hides on top of the bus just to be able to go. The girls and the nuns run into many adventures along the way, including the bus being stalled on the railroad tracks, a gang of motorcycle riders bother them and they are caught in the middle of the filming of a western. The trip is being looked after by a more open-minded nun who thinks more on the girls' level.