It's Charity Day in Popetown, a day when the Cardinals drain visitors of their spare cash, and a day when The Pope is expected to ride in the armourglassed PopeWagon and address the gathered crowds.
But problems have arisen. Firstly The Pope simply doesn't want to cooperate, and is delivering a tantrum instead, secondly the PopeWagon has had yellow paint spilt all over it, and it needs to be dazzling white instead.
In order to get the car repainted, Father Nicholas and Sister Marie must get it to a garage. This means driving out of Popetown into unfamiliar parts of the city... parts of the city which seem to be nothing more than an endless 'vice' district... hardly the place for two saintly residents of Popetown to be seen.