Jessy, Nessy, Squiggles and Dollop are waiting for Later, because that's when Great Grandmonster is going to bring them to the beach. But when will it be Later? And how will they know?

Jessy, Nessy and Knock are on the beach trying to build a sand apartment building, but it keeps getting knocked down! They realise it's the waves, so set off to discover why the waves are so wavy today?

All the lights in town have stopped working; Jessy's nightlight, the light in the library, even Mr. Lampowicz. Why have they turned off? And how can they get them back on again?