One spring day in Vienna, Graff, an earnest young Austrian student who has just failed his exams, meets Siggy, a wildly eccentric motorcycle mechanic and philosopher. Together they roam the countryside astride a 700cc Royal Enfield racer. Lovely long-limbed Gallen soon joins them. Moving rapidly from incident to incident in the best picaresque tradition, the drama climaxes in "the great zoo bust" as all forms of beast--including human--break free.