"So, Agent Koenig, why do you think the killer drove the car away and brought it back?" I asked. "Let me put on my thinking cap." I held a finger to my cheek in a parody of concentration.

Actually, I already had a pretty good idea. Or rather, three ideas. One, the killer wanted to get the car cleaned to erase any forensic traces. Two, the killer had to fetch something and take it back to the cemetery to complete the picture he was trying to paint. Three, the killer heard us coming and wanted to get the car out of there while we were approaching, so we wouldn't see who was driving.

Seth Koenig looked from me to Tolliver with a stony face, not amused in the least. He said. "That man is dead. If you can't take that seriously, you're just not human."

"Playing the not-human card," I said to Tolliver.

"As if we hadn't heard that one before," he said.

"I know what you're doing," the agent said. "And you're good at it, I'll give you that. Were the rocks in the grave when you saw the body?"

"We didn't see the body," I said flatly.

"They were big rocks. Big enough to crack a skull," Koenig said. "I think that's why the killer had to come and go. He had to go get a couple of big rocks. He threw them down in the grave so they'd land on Nunley's head—might have taken a couple of tries. The killer wanted the scene to look as though Nunley might have tripped and fallen into the open grave. But we're pretty sure that just didn't happen. Dr. Nunley was almost certainly murdered."

"Dum-dum-dum," I said.

"I know you're not laughing inside about this," Koenig said. "I know you want me to leave so you can talk about it. I'm letting you know I'm available for further conversation. And if you remember anything, you're smart enough to realize we need to know about it." He rose, in an easy motion that made me envious.

"We understand," Tolliver said, getting up at the same time. He stood between Koenig and me. "We'll be talking to you." He hesitated. "I appreciate that you're doing your best with this case. It's bothered Harper a lot, too." He looked back at me, and I nodded. Though we were ready, past ready, for Koenig to leave, this had been a much more amicable interview than we usually had with anyone who carried a badge.

When the door shut behind Koenig, Tolliver didn't move for a long moment. Then he turned to me with raised brows.

"That was different," I agreed.

"The bad thing about him being halfway nice is that I almost don't like lying to him," my brother said. "The good thing is, he gave us a lot of useful information." His face darkened. "Like the time of death."