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Chapter 35

“And this,” I added, pointing with my pen to the comma between the two letters on the Post-it. “I wasn’t sure what that was there for. But then I remembered. It wasn’t a comma, just a jotted number, part of a formula: N2O—nitrous oxide; laughing gas, which you have stored uprightnext to the oxygen in the dock area.”

The man had turned white now. He was staring at me in something approaching horror.

“Now, the cylinder,” I continued. “It has none of your prints on it. I imagine you wiped them off, or perhaps you wear gloves when doing a delivery.” Without waiting for a response, I added, “But the oxygen label—I have to admit, you did a good job with the gluing there. It’s just the same as the other cylinders. I haven’t removed it, but I imagine if I do, I might find the nitrous oxide label underneath. What do you think?”

He looked at me now with something like pleading in his eyes.

“Okay,” I said. “Now that I know whatyou did, I’d like to know why?”