The three corpses just unearthed by McCready’s team had gradually attracted a cloud of blowflies, some of which strayed — either at random, or in an excess of eagerness — from the faces of the dead to the eyes and nostrils of the quick, causing the agents to squint and swat at the unwelcome intruders. Off to one side was a large mound of sifted dirt, plus piles of clay clods and rocks too big and too hard to pass through the quarter-inch wire mesh. On the ground beside the dirt lay the screen and — atop the mesh — three cartridge cases, two cigarette butts, and one wad of chewing gum, plus a gum wrapper.
I scrutinized the screen, then the bodies, then the hole in the ground, taking my time before turning to face the assembled agents. “That’s it? That’s all you got?” Their expressions, which had been confident and proud a moment before, turned nervous when I added, “So y’all just ran out of steam before you got to the fourth body?” Exchanging worried glances, they returned to the edge of the grave, their eyes scanning its floor and walls. I chuckled. “Kidding,” I said, and a chorus of good-natured groans ensued. “Okay, so tell me what you’ve learned from the scene.”
I pointed at Kimball, the eager young agent who’d cast the tire tracks. “Agent Kimball,” I said. “You like to make a good… impression.” More groans, as the dreadful pun sank in. “What else does that rut tell us, besides the fact that the puddle had dried up by the time the tracks were made?” McCready had texted me a few notes on the team’s findings, starting with their observations about the tire impressions. Kimball frowned, so I gave him a hint. “How many sets of tracks did you cast?”
“Just the one,” he said. “That’s all…” He hesitated, his eyes darting back and forth, then the light dawned. “Ah — they all rode in together.”
“Bingo,” I said. “But they didn’t all ride out together. And what about the grave? What does the evidence there tell us?”
“The cartridge cases are from two different weapons,” said one of the dirt sifters. “They’re all nine-millimeter Remington, but there’s two different firing-pin impressions. One’s round, the other’s rectangular.” I nodded approvingly; when I’d asked a friend on the campus police force for spent shells, I’d specifically requested shells from two different handguns, so I was pleased that the difference had been noticed. “Also,” he went on, “the cigarette butts are two different brands. So we might get two different DNA profiles from those.”
“Good,” I said. “Maybe there’s DNA in the gum, too — and maybe the gum chewer’s not one of the smokers. So there could be three DNA profiles, right?” Heads nodded. “Okay, let’s talk taphonomy — the arrangement of the items you excavated. What did you learn as you unearthed the bodies?”
“All three were killed with a single shot to the back of the head,” said a guy whose nerdy, Coke-bottle glasses were offset by immense, chiseled jaw muscles, gleaming with sweat and smears of clay. “Execution style.” I nodded, slightly self-conscious about this part. The shots to the head were the least realistic part of the exercise, because the shots — unlike the corpses themselves — were fakes. It had struck me as unnecessary and disrespectful to fire bullets into donated bodies, so I’d settled instead for daubing a small circle of red dye onto the back of each head, and a larger circle on each forehead, to simulate entry and exit wounds.
“What else?” A long silence ensued. “Did you find blood in the grave?” Heads shook slowly. “Did you find blood anywhere besides on the wounds themselves?” More head shaking; several of the agents now cast nervous sidelong glances at one another. “So what does that suggest to you?”
The blond woman raised a hand. “It suggests they were killed somewhere else,” she said. “And then brought here.”
I gave her a thumbs-up. “Which explains why there was only one vehicle. Tell me — how often do drug traffickers and drug buyers carpool to the place where the deal’s going down?” A few of the agents laughed, but Kimball, the tread caster, winced, as he should have: Kimball, of all people, should have given more thought to the absence of a second vehicle. “Also,” I went on, “how likely is it that only three bullets would be fired during a drug-deal shoot-out? All of them to the back of the victims’ heads?” I could see them rethinking the scenario. “Anything else?” The agents looked from the grave to the bodies and back to the grave, then at me once more. My questions made it clear that they were still missing something — still failing to connect important dots — but apparently they needed a hint. “Look closely at the three faces,” I said. “See any differences?”
“Ah,” said the nimbus-haired blonde. “The two ‘buyers’ look a lot better than our guy. A lot… fresher.”
“Bingo,” I said. “They show no signs of decomposition, and no insect activity. Look at your ‘undercover agent.’ He’s a mess — he’s starting to bloat, and he’s got maggots in his mouth and nostrils. Anybody look in there?” Several of the agents grimaced; most shook their heads sheepishly. “So if you compare the condition of the bodies, what does the difference in decay tell you?”
“He was killed before the other two,” said Boatman, the agent who’d noticed the absence of mud spatter beside the tire tracks.
“Exactly,” I said, pulling on a pair of purple nitrile gloves. “Also, your undercover guy was probably outdoors, or maybe stashed outdoors for a while — someplace where the blowflies could get to him.” I pointed a purple finger at the puffed-up face again. “Blowflies like to lay their eggs in the moist orifices of the body,” I went on. “The mouth, the nose, the eyes, the ears, even the genitals, if those are accessible. But especially, especially, any bloody wound.” I stooped beside the dead “agent” and lifted his head. I had gone to the trouble of mixing a bit of actual blood — pig blood — with the red food coloring on his head, and I’d brought him out to the Body Farm two days before I’d brought the other bodies. During that time, his “gunshot wound” had attracted legions of flies, and by the time I’d placed the bodies in the ground, maggots had begun colonizing his hair, forehead, and orifices. “Next time, check for maggots. And collect the biggest ones.” I bent down and plucked a quarter-inch specimen from an eye socket, holding it in my palm for them to inspect. “A forensic entomologist could tell you that this maggot hatched three or four days ago,” I said. “Which — if I remember right — is just about the time your undercover agent dropped off the radar screen. Is that correct, Agent McCready?”
“That’s correct, Dr. Brockton.”
I flicked the maggot into the woods. It was time to reveal the final plot twist in the scenario. When I’d first phoned to suggest the idea, McCready had sounded dubious. As we talked, though, he warmed to the idea, and by the end of the call, he’d embraced the scenario enthusiastically: “A good lesson in investigative skepticism,” he’d called it.
“So,” I said to the team of trainees, “knowing that these other two guys were killed a couple days after your agent — and knowing that all of them were brought out here and buried together…”—I paused, giving them time to think and rethink before offering the final hint—“what does that tell you about your confidential informant?”
“It tells us he’s a lying sack of shit,” Kimball blurted. His face was flushed and his tone was angry, as if the corpse really was a murdered FBI agent, rather than a married insurance agent who’d had a heart attack during a tryst with his mistress. “It tells us the C.I.’s whole story is bullshit,” Kimball fumed, smacking a fist into an open palm. “Hell, maybe he even set up our guy — ratted him out to the traffickers.”