‘Ah … first comes gender. As a rule, it’s easy to determine gender in adults if the remains include the pelvic bones. The pelvis of a woman is generally broader than that of a man. It has to be wider in females because it surrounds the birth canal, and a baby’s head has to pass between the bones of the pubis. Without the pubis, the probability of making a correct identification of gender declines. Generally it comes down to size differences, but there’s a certain amount of overlap in the middle. There are approximately ten per cent of individuals who confuse the middle ground.’

‘We do have some very large young women walking around Edendale.’

‘It’s not a question of obesity,’ said Jamieson, ‘but of height, the width of the shoulders, the density of the bone …’

‘And in this case …’

‘In both cases, the pelvis was clearly female. It was obvious even in the field. For both Victim A and Victim B, the pelvis is broader at the hips, with a raised sacro-iliac joint, a wide sciatic notch, a greater sub-pubic angle. All part of the geometry of birth. The skull can also be a help, but of course …’

‘We don’t have two skulls.’

‘Not for Victim B. No, we don’t.’

Jamieson paused, allowing for more questions. ‘Now, race is a question we’re often asked to pronounce on. But it’s getting more difficult. Some characteristics of particular populations are evident in the skeleton, but there’s a lot of variation, even within groups that are historically pure. In the case of Victim A, we have the hair mat, which had sloughed off the skull. As you can see from the first picture, it’s very dark brown and slightly wavy. That, plus the shape of the teeth, mark the victim as white, where the discoloured skin might have been misleading.’

‘And Victim … I mean, the second woman?’ said Fry.

‘We can’t be sure, Sergeant. Completely skeletalized remains, and the absence of a skull – well, I’m sorry, but …’

‘OK.’

‘Now, age. By the time a person reaches the age of twenty, most bone growth is complete, the epiphyses are united and most teeth are fully calcified. So we look at several different structures: skull sutures, clavicles, pelvis.’

Jamieson presented another series of photographs on the screen.

‘In Victim A, the bones of the pelvis were dense and smooth, with a marked absence of grain; the bones of a mature but young woman. Her clavicles had not fully matured, and the basilar structure in the skull was only partly fused, an indicator that she was not yet twenty-five. Factoring all the indicators together, I’m confident that Victim A was somewhere between twenty and twenty-five. Victim B is a little older, fully matured. Without the skull, it’s difficult, but I’d say between twenty-five and thirty.’

‘Height, Doctor?’