“You were saying?” Clapper said to Gideon
“I was saying that what this is, is a left tibia. The tibia is the-”
“Shin bone,” Robb said with an eager smile. If he’d been American, Gideon thought, and this had been the 1940s, he might have made a Hollywood living portraying nice, young, small-town soda jerks. He reminded Gideon of all those bright-eyed, painfully alert young students trying to make a good impression on the first day of class. And as he generally liked them, he’d taken liking to the young cop.
“Right. And what we have is the proximal three-quarters or so, that is, the-”
“The end closer to the center of the body. In the case of the tibia, that would be the upper part, near the knee.” He pointed. “The patella would be attached right here, then?”
“Kyle.” Clapper wearily exhaled a lungful of blue smoke. “We know you’re a clever lad who’s been to university and you’re very intelligent. Now why don’t you just let the man tell his story without interrupting after every two words?”
Robb’s face stiffened with its first dull show of resentment, quickly snuffed out. “Sorry about that, sir.”
“It’s not as if I don’t know what a shin bone is, now is it?”
“No, sir, I didn’t mean to imply-”
Clapper turned away from him toward Gideon. “Do you suppose we can get on with it, Doctor Oliver?”
Ah, was that what Clapper’s problem was? An ageing, old-guard policeman, ill-educated and burnt out, who’d never risen beyond the rank of constable sergeant, stuck away in a tiny, crimeless village, in the remotest place in all of Merrie Olde England, to run out his time until retirement? And burdened with a young, personable, college-educated youth who was clearly on his way up the ladder on which Clapper had climbed but a couple of dingy rungs at the bottom? Gideon felt his first flicker of sympathy for the older man.
But not as much as he felt for Robb.
“That’s right, Constable, the patella would be about there, but it doesn’t really attach to the tibia itself, or to any bone. It’s embedded in the terminal tendon of the quadriceps femoris -the big muscle in the front of the thigh-and actually sits in a little hollow at the distal end of the femur, just above the tibia.”
This was said equally to gratify Robb and to irritate Clapper, and judging by their reactions, he’d succeeded. Robb looked at him gratefully, while Clapper heaved a huge sigh and looked at his watch.
Better get on with it, all right, Gideon thought, before I lose him altogether.
“This is the right tibia of an adult male who died sometime in the last ten years.” He paused, expecting a challenge from Clapper-how do you know it’s a male? how do you know he’s an adult? how do you know when he died?-but the sergeant merely blew smoke at the ceiling and continued to look fidgety and preoccupied.
“The markings on it indicate a dismemberment, which in turn strongly suggests a homicide, at least to me.” He waited again for Clapper to object, and this time he did.
“A homicide, is it now?” the sergeant said with elephantine joviality. “Kyle, lad, when was the last homicide we had here in these delightful islands?”
“Don’t know, sir. Before my time, that’s for sure.”
“You see, Professor,” Clapper said, “we don’t much go in for that sort of thing in this little corner of the world. Our usual run of problems, on those rare occasions when we have them, involves disorderly conduct, antisocial behavior, noise complaints-alcohol-related things, generally speaking. Although, if I’m going to be honest, I have to admit, there was the case of the purloined piglet from Farmer Follet’s van on Market Day last.”
“We don’t much go in for murder and dismemberment in my little corner of the world either,” Gideon said curtly, “but that doesn’t mean they don’t happen.” Without waiting for Clapper to reply, he picked up where he’d left off. “The cut that severed the bone was made by a saw. So was this groove right next to the cut-it’s a hesitation cut, the kind of thing you get when you’re having a little trouble placing the saw at first. But these grooves here”-he pointed to two shallow cut-marks at a slight angle to the hesitation cut-“were made with a knife.”
“A knife and a saw?” Clapper said with a skeptical lift of his eyebrows.
“Yes, and that’s what makes me think this guy was almost certainly dismembered. An old bone with saw marks on it-or some knife scratchings-who knows, that might be nothing more than something that was found and then whittled or sawed for… well, for some innocent reason, not that anything comes to mind. But a knife and a saw, that’s different.”
Robb shook his head, puzzled. “But why-”
“You’d want a knife to cut down through the soft tissue, then a saw to get through the bone.”
“Ah,” an engrossed Robb said, but Clapper looked as restless and dubious as ever.
Gideon plowed ahead anyway. “You can see the difference between the two kinds of cuts by-”
“The knife marks are narrower than the saw marks?” Robb asked with a wary glance at Clapper, who continued to say nothing. “Is that the difference?”
“More or less. The teeth on a saw are ‘set’; that is, they’re at a slight outward angle to the blade on each side, so the groove that a saw leaves is going to be very slightly wider than the actual blade. On the other hand, a knife has no set, so its groove is going to be a better indication of its actual width. More than that, a knife blade is V-shaped in cross-section, so it leaves a V-shaped groove, whereas a saw-”
“Leaves a square, flat-bottomed one,” Robb finished for him, peering at the various notches and nodding vigorously.
“Well, U-shaped would probably be more accurate, if you look closely.”
“Yes, I see.”
“Besides that, a V-shaped groove in fresh bone is more likely to close up a little afterward, whereas a wider, U-shaped one won’t, which means that not only do saw cuts give an over-impression of blade width, but knife cuts tend to give a slight under-impression.”
“What about a serrated knife?” Clapper put in. “That has teeth.”
“Not set at an angle to the blade,” Gideon said. “It leaves a slightly different mark than a non-serrated one, but it’s still V-shaped.”
“And why, if you don’t mind my asking, are you so sure the big cut, the one that cut it in two, is from a saw?” Clapper asked in the spirit of a defense attorney who found himself short of serious ammunition but had every intention of obstructing anyway. “Why not an ax? That’d be my choice. Speed things up a bit, wouldn’t it?”
“No, this is a clean cut. There would have been some crushing, some splintering, with an ax, and probably more than one blow to get through the bone. And only a saw would have left these parallel striations in the cut end. They show the direction of the saw cut, by the way, which was from back to front. And-”
Clapper’s sigh was monumental. He got up to grind out his cigarette in the metal ashtray on Robb’s desk, then went to the window behind the desk and looked out at the garage of the house next door, a bored and restless man.
“And there’s another way you can tell too,” Gideon went on, partly for Robb’s continuing edification, but mostly for the hell of it. He took the bone back from the young constable, who had been holding it while he followed Gideon’s remarks, and touched his finger to a thin, quarter-inch spike extending from the cut end. “This is the breakaway spur that you get with saw cuts. The bone snaps off from its own weight just before the saw blade gets all the way through.”
“Yes, the same thing happens when one saws a piece of wood, doesn’t it?” Robb said. “Unless, of course, one turns it over and finishes sawing through from the other side.”
“Right, but when you’re dismembering a corpse, as the sergeant correctly suggested, you’re probably going to be a lot more interested in speed than in neatness.”