Look out, Nan! called Dorothy, suddenly, as Nan stood for a moment fixing her belt. But the warning came too late, for the next minute a wave picked Nan up and tossed her with such force against a pier, that everybody thought she must be hurt. Mrs. Bobbsey was quite frightened, and ran out on the beach, putting Freddie and Flossie at a safe distance from the water, while she made her way to where Nan had been tossed.