Ruth's parents talk about heaven as if it is very familiar, a kind of cosmic shopping centre where they will know their way around and have free passes for the park-and-ride, and where Ruth will languish forever in the underground car park. Until she is Born Again, of course. Ruth prefers the Catholic heaven, remembered from student trips to Italy and Spain. Vast cloudy skies, incense and smoke, darkness and mystery. Ruth likes the Vast: paintings by John Martin, the Vatican, the Norfolk sky. Just as well, she thinks wryly as she negotiates the turn into the university grounds.

The university consists of long, low buildings, linked by glass walkways. On grey mornings like this it looks inviting, the buttery light shining out across the myriad car parks, a row of dwarf lamps lighting the way to the Archaeology and Natural Sciences Building. Closer to, it looks less impressive. Though the building is only ten years old, cracks are appearing in the concrete facade, there is graffiti on the walls and a good third of the dwarf lamps don't work. Ruth hardly notices this, however, as she parks in her usual space and hauls out her heavy rucksack heavy because it is half-full of bones.

Climbing the dank-smelling staircase to her office, she thinks about her first lecture: First Principles in Excavation. Although they are postgraduates, many of her students will have little or no first-hand experience of digs.

Many are from overseas (the university needs the fees) and the frozen East Anglian earth will be quite a culture shock for them. This is why they won't do their first official dig until April.

As she scrabbles for her key card in the corridor, she is aware of two people approaching her. One is Phil, the Head of Department, the other she doesn't recognise. He is tall and dark, with greying hair cut very short and there is something hard about him, something contained and slightly dangerous that makes her think that he can't be a student and certainly not a lecturer. She stands aside to let them pass but, to her surprise, Phil stops in front of her and speaks in a serious voice which nevertheless contains an ill-concealed edge of excitement.