Mama and Papa are away for the afternoon, so sisters Sadie and Flora decide to throw a fancy pretend tea party in their garden by the sea.

When the girls are joined by a surprise guest -- an odd-looking fisherman who wolfs down their cake -- they quickly realize something is not quite right. Is that a silver fin on the fisherman's neck, beneath his bib? And are those double rows of sharp, sharp teeth in his mouth?

This fishy guest -- is he... he must be... a shark!!

Join this unstoppable sister duo as they summon all their strength and cleverness -- and a little bit of Flora's unique magic -- to vanquish the shark... all before Mama and Papa get home.