She laughed and said, “Go on, don’t pull that stuff on me. Tell me all about the family mystery — The Case of the Substitute Face.”

“You know about all there is to know about it,” Mason told her. “The photographs were switched.”

“Who did the switching, and why?” Della asked.

“I don’t know,” Mason admitted. “There are complicating factors. Come on up on the boat deck and I’ll tell you about them.”

They climbed the stairway, walked past the gymnasium, across the deck tennis court, and found a sheltered spot in the lee of the rooms used as ship’s hospital. Mason told Della Street of his conversation with Mrs. Newberry. “So,” she said when he had finished, “you sent a radiogram to Paul Drake.”

He nodded.

She laughed. “Well, that’ll be a good preliminary training for Paul. He’s had a rest while you were batting around the Orient. I’ll bet he missed the wild scramble of your work. How about breakfast?”

He nodded. “In a minute. What do you think of her?”

“Of whom?”

“Of your cabin-mate.”