"Some one might have come in through the window."
"A fat chance, isn't there!" laughed Billie, pointing to the only window in the room which was protected with long and heavy iron bars, set so closely together that a child would have had trouble in squeezing through—much less a man.
"Does look a little difficult," replied Adrian.
"Worse than difficult. Impossible," was Donald's comment.
"Did you hear any noise?" asked Billie of Lucia.
"None whatever."
"And you have never seen the box before?"
Lucia wrinkled her brows and thought deeply.
"Do you know," she finally said, "I have a sort of a dim recollection that, away back in my childhood somewhere, I have seen it or one just like it."
"Away back in your childhood," laughed Donald, "couldn't have been so very far, Señorita."