“Then there is a hollow behind the wall.”
“There must be; and perhaps a passage communicating with the outside; how else is it to be explained?”
“You are right, Fritz!”
John Block was told. He put his ear against the wall, and said positively:
“It’s the albatross’s cry: I recognise it.”
“And if the albatross is there,” said Fritz, “little Bob must be there too.”
“But how could they both have got in?” the captain asked.
“That we will find out,” John Block replied. Frank and Jenny and Dolly were now told. James and his wife recovered a little hope.
“He is there! He is there!” Susan said over and over again.
John Block had lighted one of the thick candles. That the albatross was behind the wall nobody could doubt, for its cry continued to be heard.