Colin the Crab, the most skillful builder on the eastern riverbank, never hesitates to help his friends. Now Colin is busy with his own new project-a garden pavilion for his home. But after a week of hard work, the pavilion of his dreams is still unfinished. Even worse, a boisterous fish family has taken over the construction site. The exhausted Colin buries himself under a blanket and refuses to open his curtains. Puzzled, Colin's friends call an emergency meeting-it's time for them to take action

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Klaus Krabbe, den dygtigste h ndv rker p den stlige flodbred, t nker aldrig to gange, f r han hj lper sine venner. Efter en uges h rdt arbejde, st r det bl lysthus, han har dr mt om at f bygget sig i haven, stadig uf rdigt, og en h jr stet fiskefamilie har invaderet hans byggeplads.

Klaus, som er helt udmattet, gemmer sig under dynen og n gter at tr kke gardinerne fra. Klaus' venner undrer sig. De indkalder til hastem de. Det er p tide, vennerne tager aff re.