“I think it might be well to examine that room,” suggested Patsy.

So they reentered the house and, followed by Miguel, ascended to the second floor. The door of the library was ajar and those seated there, seeing Arthur and the girls pass, came trooping out to ask what they were doing.

Patsy briefly explained the new theory they had conceived to account for the disappearance of baby and the two nurses, and the idea was so startling that all became eager to join in the investigation.

They invaded the vacant room in a body, several of the men carrying lamps. It was in size and shape a duplicate of the blue room, with its one window deeply embedded in the wall, the surface of the embrasure being covered with heavy redwood planks.

From the fact that this room lay directly over the small one occupied by Inez, in which was the wall cavity they had recently explored, they conceived the idea that the wall here might also be hollow. Pounding upon it, however, had no effect in determining this, for kiln-baked adobe is not resonant and it was impossible to discover from any surface indication whether there were eight feet of closely set blocks or less. Careful search for any sign of an opening proved futile.

Finally old Miguel said:

“Next room was room of Señor Cristoval. Eet was room hees father live in, too; the old señor who build thees part of house. If there ees way to get in wall, from upstairs, it ees there.”

“To be sure,” said practical Beth, catching at the suggestion; “it was there that Major Doyle heard the baby cry.”

So on they all trooped into the blue room, where the wall was likewise carefully inspected. While this was being done Rudolph looked at his watch and found it was after four o’clock.

“It will soon be daylight,” said he to his wife. “What a night it has been! It seems a month since we arrived here and found Toodlums gone.”