Hunt (Deadly #4) by Morris Gleitzman

The Brats were almost upon us with their ropes and nets. . . 

Suddenly there was a roar. The sound of an enormous gurgle filled the air. It was like the squealing of a million bath tubs after their plugs had been pulled. A whirlpool had formed. It swirled around at an incredible speed.

They spun like flies clinging to a crazy merry-go-round.

Beanie began to howl with fear . . .