A king has three sons and is determined that one shall be his heir - but which? He orders them to marry and decrees that the one who picks the best wife shall be the next king. The youngest finds himself marrying a frog, against his better judgement. But when it turns out that the frog is extraordinarily gifted in such skills as carpet weaving and baking, he looks like winning the contest to be king. His frog princess is indeed a real princess under a magic spell.