“Ye’ll nae lose the house, Flora,” Rory grumbled, “nor need fairy tales o’ treasures to keep it.”

“The new journal’s no fairy tale, Mr. McNab,” Jupiter said.

“Call me Rory, boy, and I’ll admit the journal’s real if Flora says so,” Rory said grudgingly. “But it no proves the treasure’s more than the nonsense of fools.”

“But the letter, Rory!” young Cluny cried.

“Letter?” Jupiter repeated.

Rory ignored the leader of the trio. His eyes narrowed. “We’d best have a read o’ that journal. Hand it to me.”

Cluny took the journal from his mother, and gave it to Rory. The two of them sat on a long bench in front of the smouldering fire and began to read the journal. Mrs. Gunn nodded thoughtfully.

“Yes,” she said, “if there was a second journal, it would have been in that chest. My husband told me that his grandfather, Angus’s son, found the original journal in the chest. Grandfather Gunn always believed there was a treasure, and that the clue to it was in old Angus’s journal. But his son — my husband’s father — said that the journal told nothing, and the treasure was just a legend.”

“Why was Angus’s son so sure, Mrs. Gunn?” Bob asked.

“Well, there’s a letter, you see? Great-grandfather Angus —” She stopped and smiled. “Perhaps I should begin at the beginning, boys. How much do you know about old Angus?”

They told her what they had found out about the wreck of the Argyll Queen and the murder of Angus Gunn back in 1872.

“You’ve read the manuscript the Historical Society is preparing? Then you know most of the story. I told the Society as much as I could — everything that I’d learned from my husband,” Mrs. Gunn said. “After the wreck, and his wanderings round California, old Angus found this valley. It reminded him of his old home in the Highlands of Scotland — especially because of the pond and its island. In Scotland, Gunn Lodge is on the shores of a long inlet of the sea — Phantom Loch. There’s an island in the loch connected to the shore by a series of great boulders, called the Phantom’s Steps — very like the little island in our pond.”

Jupiter exclaimed, “So old Angus built this house exactly like Gunn Lodge in Scotland! That’s why it looks so odd for California.”

“That’s right, Jupiter,” Mrs. Gunn acknowledged. “The real Gunn Lodge was originally built in 1352. It was called Gunn Castle then, because it was no more than a fortified tower. You needed a stronghold to protect yourself in those days.

“Over the years,” Mrs. Gunn went on, “the original tower-house was added on to and remodelled to make the house you see here. The lodge still has details that remind you of a castle, though it couldn’t be defended easily any more.

The old tower came in handy after the Gunns took to the sea in the seventeenth century. Their wives used to stand on it watching for the ships to return up the loch.”

“Same idea as a New England widow’s walk,” commented Bob.

Pete burst out, “But what about the letter, ma’am?”

“After Angus found the valley and the pond that looked so much like home, he built the house. It took him almost two years. Then he sent for his wife and son. But when they got here from Scotland months later, old Angus was dead and so were his murderers. His wife, Laura, found a letter addressed to her and hidden in an old bed-warmer.”

“Something almost no one would use except his wife!” Jupiter said with satisfaction.

“His son thought that, too, when all the rumours of treasure started,” Mrs. Gunn said. “He was sure the letter was intended to disclose the treasure, and it seemed to refer to old Angus’s journal. But Grandfather Gunn never did find a clue in Angus’s journal or anywhere else.”

“Can we see the letter, ma’am?” Pete urged.

“Of course, boys. It’s in my bedroom in a scrapbook.”

Jupiter asked, “You don’t keep it with old Angus’s other things?”

“No, I never did,” said Mrs. Gunn.

She left the living-room and returned in a moment with a scrapbook. The boys crowded round to read the old, yellowed letter:

Laura, dear

You will be here soon, but lately I fear I am being watched. I must write these last, urgent words in the knowledge that other eyes may see them.

Remember that I loved you and promised to give you a golden life. Remember what I loved at home, and the Secret of the loch. Follow my last course, read what my days built for you. See the secret in a mirror.

The boys looked at each other, and read the old letter again.

“According to my husband, Grandfather Gunn was sure that the words golden life referred to a treasure left for Laura,” Mrs. Gunn said. “That last line made him search everything he could see in every mirror in the house. When he found nothing, he decided that the words read what my days built for you meant that the clue was in Angus’s journal. But he still never found anything.”

“Because he didn’t have the second journal,” Jupiter declared. “The letter says follow my last course. The word course is sailor-talk for a ship’s direction, where it’s going, its path. The letter is telling Laura to read about what Angus did last for a clue to the treasure — and that has to be in the second journal. It covers the last two months before he wrote the letter. What did old Angus do the last two months?”

Rory snorted and threw down the second journal. “He nae did anything about a treasure! All this journal does is tell where he went and what he did to build some surprise for Laura.”

“I don’t see any clues, fellows,” Cluny admitted unhappily.

“I guess I didn’t, either,” Jupiter confessed. “But… Mrs. Gunn, what did old Angus love at home, and what is the secret of Phantom Loch?”

“I have no idea what he loved at home, Jupiter,” Mrs. Gunn said. “The secret of the loch is a very ancient legend back in Scotland. The phantom of an early Gunn is supposed to appear on foggy winter mornings to stand on a crag and stare down the loch, watching for enemies. They say he was killed by Vikings in the ninth century, and is guarding against another raid. The legend of the phantom gave the loch its name.”

“A ghost story,” Rory snapped. “To add to a treasure fable!”

“The treasure’s no fable to Java Jim!” Pete said hotly.

“What about the man in the green VW?” Bob demanded.

“And all the break-ins?” Cluny echoed.

Rory lapsed into a sullen silence.

“Mrs. Gunn?” Jupiter said after a moment. “How many people would know what’s in the letter and the first journal?”

“Over the years, Jupiter, many people must have read them.”

“Then that could explain the break-ins,” Jupiter said. “Java Jim must know about them, and must think the letter does refer to a journal. There’s a gap of two months between the last entry in the first journal and Angus’s murder. Java Jim probably realised there had to be a second journal! So he searched for it!”

Then he’s another big fool,” Rory muttered.

“I don’t think so,” Jupiter said. “Look what Angus said in the letter — I must write these last, urgent words in the knowledge that other eyes may see them. So he wrote a puzzle he thought Laura could solve. I’m convinced that Angus did hide some treasure, which can be found by solving the puzzle with a clue in the second journal!”

Bob, Pete, and young Cluny nodded eagerly.

“Perhaps so, Jupiter,” Mrs. Gunn said, “but how could anyone hope to solve the puzzle if Laura couldn’t? It was written for her.”

“We’ll figure it out, ma’am!” Bob cried.

“We’ve solved lots of puzzles and mysteries!” Pete said.

Jupiter drew himself up taller. “As it happens, Mrs. Gunn, solving mysteries and conundrums is our business.” He took a card from his pocket and presented it to Mrs. Gunn.

Cluny, wide-eyed, read it over his mother’s shoulder: