Seven rings were made long ago in the days of the Queens of old, seven highly magical rings to help a ruler to rule, but they proved anything but helpful.
The characters are given the task of transporting a flask of highly volatile liquid a long distance. The flask cannot be shaken too much or it will explode. The adventure involves stormy sea-voyages, bumpy cart rides through densely populated towns and horseback combat. In short there are many opportunities for it to break and explode.