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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Kalle Krabi on kõige osavam ehitaja jõe idakaldal ega kõhkle kunagi, et oma sõpru aidata. Pärast nädalaid rasket tööd on tema sinine unelmate ajapaviljon ikka pooleli, ja tema ehitusplatsi on vallutanud pöörane kalaperekond.

Kurnatud Kalle peidab end voodisse teki alla ja keeldub avamast kardinaid. Kalle sõbrad on hämmingus. Kutsutakse kokku erakorraline koosolek. Seekord peavad sõbrad midagi ette võtma.