“You mean she isn’t going to give you the other half of that bill?”

“Why should she? Peltham is satisfied, and she’s satisfied. Things are moving fine. She has an iron-clad alibi for Tuesday morning. At least, she says she has, and I give her credit for being smart enough to be telling the truth. If she fixed up an alibi, she fixed up a good one.

“I’ve prodded Holcomb into the position of bringing pressure to bear all along the line, to fix the time of that murder as immediately after noon on Tuesday. I have the smaller piece of that ten-thousand-dollar bill. I can’t do anything with it until I get the other half… If I’m a big enough sap to work for nothing, why should anyone pay me for it?”

She said thoughtfully, “It does look that way, doesn’t it?”

He nodded moodily. “Anything else?” he asked.

“Drake says his men shadowed Abigail Tump, that she led them to the man he thinks is the secretary for the orphan asylum you want. He also picked up a copy of the ad which was left in the Contractor’s Journal by Miss Hastings.”

“What does the ad say?” Mason asked, dropping into his big swivel chair, elevating his feet to the desk, and taking a cigarette from the office humidor.

Della Street consulted her shorthand notebook and read, “ ‘Have nothing to add to situation. Granting interview this time would be unwise. You’re doing fine. P.’ ”

Mason said, “That’s rubbing it in… I’m doing fine, am I? Yes, Della. Take this down. Type it out and rush it over to the Contractor’s Journal. Have them carry it in their earliest possible issue: ‘P. I don’t like to contract for work without blueprints. Arrange to deliver detailed plans and specifications or anticipate serious defects in finished structure.’ Now read that back to me, Della.”

She read it back to him.