Ruth sits in Nelson's office, a cup of undrinkable coffee in front of her. It is cold in the high-ceilinged room. She is still wearing her digging trousers, baggy army-surplus, but, stupidly had taken off her thick jumper back at her house.
It seems like days ago. Her coat is still dripping and is anyway far too thin. She wishes she had worn her sou'wester or an anorak. She wraps her hands around the plastic cup. At least it is hot.
Nelson has disappeared to round up some officers to arrest Erik. Arrest Erik. The words have an impossible sound; that Erik should be a suspect in a murder case, that Ruth should be the one to direct the police to his door. It seems crazy, like a nightmare. It seems that one minute she was sitting in her little house by the Saltmarsh, preparing her lectures, grumbling about her mother and listening to Radio 4, and now she is in the middle of this drama of murder and betrayal. It is as if she has pressed the wrong button on her TV remote control and, just at this instant, she would give anything to switch back to the boring programme about crop rotation.
Nelson crashes back into the room accompanied by Judy, the policewoman Ruth met at the funeral.
'Right,' he says, grabbing his jacket, 'let's go. I'll go in the first car with Cloughie. Ruth, you follow behind with Judy. On no account are you to get out of the car. Do you understand?'
'Yes,' says Ruth, rather sulkily. She wants to remind Nelson that she is not one of his officers.
The cars set off through the night. It is still raining, a slow, steady drizzle sparkling in the headlights. The cars head out of King's Lynn and along the coast road, past deserted caravan parks and boarded-up family hotels.
Ruth leans her head against the cold window and thinks about her first view of Norfolk, arriving that summer with her tent and bedroll, driving from Norwich station with Erik and Magda, seeing the Saltmarsh in all its evening splendour, the sand stretching for miles, the sea a faint line of blue against the horizon. Could she have imagined then that this is how it would end? In a speeding police car on the way to accuse her former mentor of murder…
Nelson's car comes to a halt in front of the blameless looking seaside guest house. The Sandringham, it's called, though any resemblance to the Queen's house must exist only in the owner's fevered imagination. The look, Ruth notes, is traditional seaside kitsch: net curtains, gnomes in the garden, stained glass over the front door. Nelson and Sergeant Clough climb the crazy-paving steps and Clough leans heavily on the doorbell. The Sandringham Guest House, reads the sign, Bed and Breakfast, En-suite rooms, colour TV, home cooking. Vacancies.
Ruth cringes inside the second car. What will Erik say when he looks in the car and sees Ruth sitting there? Will he know she has betrayed him? Because, despite everything, she still thinks of it as a betrayal. She has delivered Erik into Nelson's hands. She feels like Judas.
It is nearly ten o'clock and there is only one light on inside the guest house. It's upstairs, directly above the door. Ruth remembers Erik telling her that he was the only guest – February is, after all, hardly the holiday season. Is that his light then? Is he inside, calmly working on some scholarly article about Bronze Age Field Systems?
Ruth sees the front door open. Nelson leans forward, speaking to the unseen opener. Ruth imagines him waving his warrant card like they do in films, before barging his way inside yelling, 'Police! Freeze!' But she is disappointed.
The door shuts and Nelson and Clough make their way slowly back to the car.
Nelson leans in through the window. His forearm rests on the window frame a few inches away from Ruth. She has to fight an insane desire to touch it.
'He's gone,' says Nelson.
'Gone for good?' asks Judy, twisting round in the front seat.
'Looks like it. His room's empty. He left a cheque to pay his tab.'
For a second, Ruth feels absurdly pleased that Erik hasn't run off without paying. Then she thinks, he could be a murderer, isn't that a bit worse than not paying a hotel bill?
'What now?' asks Judy.
Nelson looks at Ruth. 'Any ideas, Doctor Galloway?'
Ruth doesn't meet his eye. 'He could be with Shona, I suppose.'
Shona's house is in darkness. At first Ruth thinks that she must be out (with Erik?) but, after a few minutes, she appears at the door wearing a dressing gown. She looks rumpled and, even at this distance, slightly drunk.
Judy has gone to the door this time. Maybe this, like bereavement, is another moment when they send for a woman officer. The police, like the Neanderthals, don't seem a very enlightened society.
Shona steps back to allow Judy to enter. Alone in the car, Ruth starts to shiver. She jumps when the passenger door opens. Nelson leans in.
'Are you OK?'
'Fine,' she says, setting her jaw to stop her teeth chattering.
'You're freezing. Hang on.'
He pulls off his heavy police jacket and hands it to her.
'Put this on.'
'But it's yours.'
He shrugs. 'I'm not cold. Keep it.'
Ruth pulls on the jacket gratefully. It smells of garages and, very faintly, of Nelson's aftershave. Nelson, in his shirtsleeves, certainly does not seem cold. He jogs slightly on the balls of his feet, impatient for Judy to come back.
Ruth is reminded of the first time that she saw him and the way he had almost run up the hill towards the buried bones.
At last Judy is coming out of the house. Nelson goes to meet her. They confer quickly and then Judy gets back in the car.
'He's not there,' she tells Ruth. 'She says she hasn't seen him. I'm putting out a call to all units. The boss says I've got to take you to a safe house.'
Ruth watches Nelson getting into the other car. He gave me his jacket, she thinks, but he can't be bothered to say goodbye. Suddenly, she feels incredibly tired.
'Is there anyone you could stay with?' asks Judy.
Ruth looks back at Shona's house. The lights are off. No more girls' nights in for her there.
'A friend?' prompts Judy. 'Family?'
'There is someone,' says Ruth.
The house is one of a row of fisherman's cottages on the seafront near Burnham Ovary. Squat, whitewashed, used to withstanding the wind and rain from the sea. Ruth stands irresolute on the doorstep, listening to the waves crashing against the sea wall. What if he isn't there? Will she have to sleep under her desk at the university, to be woken at nine by Mr Tan and her other students? At the moment, it seems quite an attractive proposition.
Ruth looks back at the police car, which is discreetly waiting in the street. She wonders if the neighbours are watching behind their curtains.
'Ruth!' She swings round to see Peter silhouetted in a rectangle of light. Ruth opens her mouth to tell him about Erik and Shona and to ask him for a place to sleep but, to her intense embarrassment, she starts to cry. Huge, gulping, unromantic sobs.
Peter reaches out and draws her inside. 'It's OK,' he says. 'It's OK.'
And he shuts the door behind them.