“Remember now,” he cautioned Della Street, “not to show too much interest in that can.”

He tapped gently on the door with his knuckles.

They heard the sound of quick steps from the inside of the house, then Mrs. Gentrie flung open the door. She pressed her finger to her lips for silence. “Please don’t make any more noise than possible,” she said. “I would prefer not to have my sister-in-law in on this. She’s never been very tolerant about the children.”

Mason nodded.

“Come in,” she invited.

They filed into the house, and Mrs. Gentrie escorted them through the living room into the dining room. “I hate to ask you to talk in here,” she said in a low whisper, “but the living room is right under Rebecca’s bedroom. She wants to know everything that’s going on, and very definitely she isn’t fair to Junior. What’s more, that police lieutenant has been flattering her with a little attention, and it’s turned her head. If we talked over anything where she could hear it, Lieutenant Tragg would know all about it before noon. He flatters her, and she thinks he’s simply wonderful.”

“What did she say when she knew Junior had been arrested?” Mason asked in a low voice.

“She doesn’t know yet. I just didn’t feel up to telling her. I didn’t know when you’d come, and I knew that she’d sit up and keep up an interminable chatter.”

“What happened?” Mason asked. “Tell me in exact detail.”

Mrs. Gentrie said, “Well, of course, I expected it. Lieutenant Tragg dropped in about dinner time. And Junior wasn’t here. His father said Junior had complained of not feeling well about three o’clock in the afternoon, and he’d told the boy to go on home. Naturally, he was surprised and irritated to find Junior wasn’t here.”