Purley, as was proper, spoke to his superior. “I swear, Inspector, I’m sure I’ve seen him somewhere, but I can’t remember.”

Wolfe nodded. “A uniform makes a difference. I suggest that he was in uniform.”

“Uniform?” Purley scowled. “Army?”

Wolfe shook his head. “Mr. Cramer told me Wednesday morning that the doorman on duty at the apartment house at the time Mr. Jensen and Mr. Doyle were killed was a fat nitwit who had been hired two weeks ago and didn’t know the tenants by name, and also that he claimed to have been in the basement stoking the water heater at the moment the murders were committed. A phone call would tell us whether he is still working there.”

“He isn’t,” Cramer growled. “He left Wednesday afternoon because he didn’t like a place where people got murdered. I never saw him. Some of my men did.”

“Yeah,” Purley said, gazing at Hackett’s face. “By God, it’s him. I thought he didn’t have brains enough to know which end to pick up a shovel.”

“He is,” Wolfe declared, “a remarkable combination of fool and genius. He came to New York determined to kill Mr. Jensen and me. By the way, Mr. Hackett, you look a little dazed. Can you hear what I’m saying?”

Hackett made no sound and didn’t flutter an eyelid.

“I guess you can,” Wolfe went on. “This will interest you. I requested Military Intelligence to have an examination made of the effects of Captain Peter Root at the prison in Maryland. A few minutes ago I phoned for a report, and got it. Captain Root was lying when he stated that he was not in communication with his father and had not been for years. There are several letters from his father among his belongings, dated in the past two months, and they make it evident that his father, whose name is Thomas Root, regards him as a scion to be proud of. To the point of mania.” Wolfe wiggled a finger at Hackett. “I offer the conjecture that you are in a position to know whether that is correct or not. Is it?”

“One more day,” Hackett said in his husky croak. His hands were twitching. “One more day,” he repeated.