Heath settled himself in a chair. He took a few moments to arrange his thoughts.
"It's like this, sir. Yesterday afternoon I got to thinking. Here was Skeel murdered, same like Odell, after he'd promised to squeal; and it certainly looked as though the same guy had strangled both of 'em. Therefore, I concluded that there musta been two guys in the apartment Monday night—the Dude and the murderer—just like Mr. Vance has been saying all along. Then I figured that they knew each other pretty well, because not only did the other fellow know where the Dude lived, but he musta been wise to the fact that the Dude was going to squeal yesterday. It looked to me, sir, like they had pulled the Odell job together—which is why the Dude didn't squeal in the first place. But after the other fellow lost his nerve and threw the jewellery away, Skeel thought he'd play safe by turning state's evidence, so he phoned you."
The Sergeant smoked a moment.
"I never put much stock in Mannix and Cleaver and the doc. They weren't the kind to do a job like that, and they certainly weren't the kind that would be mixed up with a jailbird like Skeel. So I stood all three of 'em to one side, and began looking round for a bad egg—somebody who'd have been likely to be Skeel's accomplice. But first I tried to figure out what you might call the physical obstacles in the case—that is, the snags we were up against in our reconstruction of the crime."
Again he paused.
"Now, the thing that's been bothering us most is that side door. How did it get unbolted after six
