"You, Paredes?"

"I've heard nothing," Paredes answered, "except Doctor Groom's disquieting theories. It's an uncanny hour for such talk. What kind of a cry—may I ask?"

"Like a woman moaning," Bobby said, "and, Doctor, Howells has changed his position."

"What are you talking about?" the doctor cried.

"He has turned on his side as Mr. Blackburn did," Graham told him.

Paredes glanced at Bobby.

"And how was this new mystery discovered?"

Bobby caught the implication. Then the Panamanian clung to his slyly expressed doubt of Katherine which might, after all, have had its impulse in an instinct of self-preservation. Bobby knew that Graham and Katherine would guard the fashion in which the startling discovery had been made. Before he could speak for himself, indeed, Graham was answering Paredes:

"This crying seemed after a time to come from the room. We entered."

"But Miss Katherine called you up," Paredes said. "I supposed she had heard again movements in the room."