So the search continued, until at last the Hardy boys had reached the top of the tower. Here they emerged into the open air, coming through a trapdoor that led through the roof from the upper room. They were now standing on a platform, and far below them lay the city of Bayport. To the east was Barmet Bay, the waters sparkling in the sun.
The platform was quite bare. The stone walls gave no opportunity of a hiding place. Their search had been in vain.
"We were fooled, I guess," Frank admitted. "There hasn't been any one in this tower for years. I knew it as soon as I saw there were no footprints."
The boys gazed moodily down over the city, and then down over the grounds of Tower Mansion. The roofs of the mansion itself were far below, and directly across from them rose the heavy bulk of the new tower.
"Do you think he might have meant the new tower?" exclaimed Joe suddenly.
"Dad said he specified the old one."
"But he may have been mistaken. In the darkness and everything, perhaps he didn't know the difference."
"That's possible, too. It's certain that he didn't hide anything in this tower, at any rate. Although why he should say 'the old tower'—"
