Prisoner Five One Eight, Jack Wilson, has recently been released from jail, and is back roaming the streets of Victorian London. Despite his best intentions to stay out of trouble, mischief follows him everywhere he goes and he gets caught up with a band of rascals who have ambitious plans for the opening of the Great Exhibition. They are not the only gang of criminals, however, to be making plans for this event. Who will get there first, and who will be caught red-handed?