"Not at all. I am only——"

But there Nan had had to stop, for a sudden lurch of the steamer had thrown her against the wash-stand. Bess had gone sprawling on the floor.

"I—I didn't think it would be so rough," Bess had gasped out, on arising.

"I—I don't think it is going to be so awful bad," Nan had declared. And she had been right. By noon of the second day the sea was quite smooth. Neither of the girls felt a bit of seasickness and both were glad to go on deck and enjoy the sunshine.

"What a change since yesterday," said Bess, as the two girls stood by the rail looking out over the lazily rolling water. "It seems almost like magic, doesn't it?"

"It's wonderful," breathed Nan happily. "It seemed so silly to pack all my summer things when the wind was blowing like mad and it was ten above zero in Tillbury. But now I'm mighty glad we did. Whew, isn't this coat warm!"

"Cheer up," cried Bess gaily. "Maybe by to-night it will be so warm we can put all our winter things in storage and blossom out in silk georgette and white flannels like veritable butterflies from a crystal—I mean chrysalis. Nan, are you listening to me?" she demanded severely, for Nan's eyes had deserted the long line of lazy combers and were following the figures of two men, one long and one short, who were strolling slowly down the deck.

"Bess, do you see those men?" asked Nan, with a troubled inflection that caused Bess to look at her sharply.

"Yes, my dear," she answered. "My eyes are still in good working condition."

"Does there seem anything strange about them?" Nan insisted. "Anything like spying?"