One day, Moominpappa gets a very rare thing, a letter! It is from Aunt Jane, a stinkingly rich relative of whom Moominpappa is rather scared. She is great on duty, and particularly on one's duty to money, so Moominpappa packs a knapsack and flees before she arrives. And very wisely, too, for she wants Moominpappa to look after her gold doubloons when she gets too old! There are, however, those in Moominvalley who need gold for their pet projects - and those who need gold just because they like it.