"If they didn't come here, where did they go to?"
"I don't know. What did that scrap of paper say?"
"That spoke of Slay's Island. But none of the men on this tug ever heard of such a place."
"That is not to be wondered at, Dick," went on Sam. "I understand there are scores of islands in Casco Bay. It isn't likely these men from Boston would know the names of all of 'em."
They remained around the entrance to Portland harbor until noon and then Dick ordered the captain to run in and land them.
"You might go up and down the docks a bit," he said. "They might have slipped us after all."
They entered the harbor, passing the old light house, and soon were within easy reach of the docks. They looked on all sides for the Mary Delaway, but in vain.
"We have missed her!" groaned Dick.
"What are you going to do next?" questioned Tom.
"See if I can't find out in some way where the schooner went to and also find out where Slay's Island is located."
"We might get a map of Casco Bay. That would have the names of the islands on it," suggested Sam. "I know there are a great many of
