Greta was slender, rather tall, with black hair, snapping black eyes, and a body that was a fine example of perpetual motion. At this moment she was recovering from an attack of hay fever and asthma. That is why she was here, why they were all here. Isle Royale is a rare retreat for hay fever victims.

Two months before Jeanne had met Greta and had fallen in love with her. Greta could dance almost as well as Jeanne. She played the violin “divinely,” as Jeanne expressed it. So when, one midsummer day, Jeanne found her friend sitting up in bed panting for breath, and was told that only a summer on Isle Royale could bring back to her the joy of life, she had hurried away to find Florence. Together they had plotted and planned. And now, here they were.

But why on a wrecked ship? Are there no hotels on the island? Yes, there are four small hotels on Isle Royale. But what trio of happy, energetic, adventure-loving girls would choose a hotel rather than the deck of a wrecked ship for a summer outing? Some might, but not Florence, Greta, and Jeanne.

The only fear, expressed by them a half hour later over their tea, was that some unforeseen event might drive them from their strange retreat.

“Who’s afraid?” Florence swung her stout arms wide. And who indeed could be, with Florence as her protector? Strong as a man, a physical director and a gymnast, tipping the scale at one hundred and sixty pounds, she could swim a mile, row a boat through tireless hours, and handle a gun with the best of men. Nor was the gun lacking, a short, business-like rifle hung above her berth.

“Not that you’ll ever need it,” Swen Petersen, a fine young fisherman who had loaned it to her, had said. “All us fisher folks are simple and honest. And you’re not allowed to shoot animals on the Island. It’s a game preserve. But you will like to look at my rifle sometimes.” So he had left it.

Florence smiled as she recalled his words. She was enjoying “looking at it” this very moment. More than once she had taken it down to handle it lovingly. Once, on seeing a bit of wood bobbing in the water, she had taken aim and fired. The short, stout rifle had a great roar to it. And Florence had a steady aim; she had split the wood in two, first shot.

“All the same,” she thought to herself, “I wish people would not prowl around the boat at night. And what would one dive for?” she asked herself. “Three or four barrels of oil in the hold—surely they are not worth all that trouble.”

Then it struck her all of a heap that here was a mystery and perhaps some great secret.

“Does this broken hulk of a ship hide some rich treasure?” she asked herself.