“Finished, Nov. 6.”
The boys looked at one another, unable to understand.
“He was certainly doing a lot of boating that week,” said Frank. Then on the next page he found two words.
“Cabin Island.”
“Ah, now we’re getting somewhere. ‘Cabin Island.’ Sparewell had something to do with this place.”
“Perhaps that’s why he was making so many boat trips,” Joe suggested. “He may have been coming here.”
On a sudden inspiration, Frank flipped back the pages until he found the mysterious map.
“This much is clear, at any rate. Take a look at that map, fellows. What does it remind you of?”
“Cabin Island!” they shouted.
They had not noticed the resemblance before. Now, it was perfectly clear. Cabin Island was oval-shaped, and in general contour it resembled the crude drawing in the notebook.