A young owner of an experimental gyro-car undertakes a daring continental cruise that tests both machine and passengers across varied European landscapes. The narrative traces collisions, mechanical mishaps, and narrow escapes as the party crosses Alpine passes, old Roman roads and remote Balkan hills, encounters local customs and rising tensions, and negotiates swamps, a landslip and turbulent river rapids. Technical detail about the gyro-car is woven with brisk episodic adventure, culminating in final reconciliations and practical rewards after a series of hazardous and humorous trials.