"But who owns the sailboat tied up at the pier, I wonder?"
They had not observed it as they approached the pier from the other side.
"Suggests Garshaski," said Harry.
They pushed on to the green door.
"Go on in, Harry and Alice," said the old detective. "Leggett and I will watch that house on the piles. The owner of the sailboat may be inside."
Harry and Alice then pushed on into the shack.
"Too late!" cried Alice, "Garshaski has been here ahead of us!"
And indeed it looked so, for there in the middle of the floor lay a flat stone broken in two pieces.
Evidently it had served as a hearth stone and beneath where it had lain at the foot of the chimney was a newly dug hole.