Makes it sound like I’m going to be on a supermarket checkout, thought Sam.

“That’s right. And you play around with this Viking stuff, right?”

“Right,” said the woman, smiling. “The literature of Nordic mythology, folklore and legend, to be precise.”

“So not much use then. Practically, I mean.”

“I wouldn’t say that. Study of old myth systems can remind us of a lot of things the modern scientific mind has forgotten.”

“Like how to cure cancer by chewing nettles?” mocked Sam.

“Like understanding motive and cause and effect. What made Loki want to harm Balder, for instance, if that means anything to you.”

“Oh yeah. Balder was the good god, right? Like my namesake, the curate – wasn’t that what you told Thor Winander?”

“My my,” said Frek. “You do get people to talk to you, don’t you?”

“It’s my sweet Australian nature,” said Sam. “So what did make this Loki guy want to harm Balder? Because he was so good, maybe?”

“I don’t think so. Because he was so… ineffectual. Snorri Sturluson – he was a thirteenth-century Icelandic scholar – tells us how lovely and good Balder was, but then he says that none of his decisions ever really changed anything. Loki was mischievous, often downright wicked, but whatever he decided to do got done.”

“And that’s a reason for killing someone?”

“It’s a motive,” said Frek. “Loki got his comeuppance as justice required. But even this isn’t straightforward. The gods bound him in a cave with a serpent’s venom dripping on to his face so that he writhed around in immortal pain. But with every convulsion, he causes the earth itself to quake, prefiguring the great earthquakes which are to be such a dreadful feature of Ragnarok.”

“What the hell’s that?” said Sam, thinking that on the whole she’d have preferred the nettle option.

“With one k at the end, it’s the doom of the gods. With two, it’s the twilight of the gods, a more poetic notion which appealed to the Romantic imagination. It’s the end of everything, good and bad.”

Sam tried to work out what this weird woman was saying to her. Sounded like the kind of stuff that her ma could have got her head round. Maybe Pa too. She heard his voice in her head.

Truth’s like a dingo, girl. It’ll run till you get it cornered. Then watch out!

“Everything’s got to end,” she said. “You can’t stop doing what’s right because you’re scared of the consequences. Even gods should get what they deserve.”

Frek laughed and said, “Brother will kill brother, incest and adultery shall abound, there will be an axe-age, a sword-age, a wind-age, a wolf-age, before the world plunges into fire. That’s what an Icelandic prophetess said. How might a mathematician have put it?”

“There is nothing unknowable,” said Sam. “We must know. We shall know. That’s what a great mathematical prophet said. That’ll do for me.”

They were now coming up to the Forge. Frek came to a halt and blew her horn. The end of a vehicle was visible round the corner by the smithy. It looked to Sam like the Gowders’ pickup. After a moment, Thor Winander appeared and approached the car.

He raised his eyebrows when he saw Sam, then winked at her and said to Frek, “Twenty minutes, we’ll be there. You sure that Gerry’s all right with this? He was pretty unfriendly when I was preparing the site.”

“He’s fine, I promise you,” said Frek. “It will grow on him.”

“If you say so. See you later then. Cheers, young Sam.”

As Frek set the Polo in motion again, she explained, “Thor’s promised to set up a carving he’s done for me before I go back to Cambridge tomorrow.”

For a moment Sam thought she meant the splay-legged nude and wondered where the hell she could display that. Then she recalled the Other Wolf-Head Cross.

“You didn’t say who you wanted to see at the Hall,” continued Frek. “Is it my grandfather? Or my father? Because if it’s Daddy, he’s not there, I’m afraid. He was driving Angelica back to her House this morning, and I’m not sure when he’ll be back.”

Sam, who’d never stood back from a confrontation in her life, was slightly ashamed to feel relief. She still had no idea how she was going to handle a face-to-face with the man who as a child had fathered her father on another child. If she met Gerry now, all she could foresee was a shouting match, with the Gowders and Thor Winander expected on the scene any moment to make up the audience.

“Your grandfather will do,” she said.

“Will he? I’ll need to check if he’s up to it. His trip down to the Stranger was his first excursion in a little while, and one way and another it left him a little drained.”

Sam thought, she knows something. Maybe not everything, but enough.

Frek went on, “He’s talking with Mr. Madero this morning. Some academic matter, I believe…”

“Academic?” interrupted Sam, tired of obliquity. “Bit more than that, I’d say.”

“Would you now?” murmured Frek. “Someone else who’s opened up to you? How interesting. I wouldn’t have thought you had a lot in common. Perhaps time together trapped in the darkness brought you close?”

They were turning into the driveway of the Hall now. Frek brought the car to a halt before the front door.

“You should be careful, my dear,” she said, putting her hand on to Sam’s knee. “There’s not much future in falling for a priest.”

She squeezed gently.

Sam recalled what Edie Appledore had told her and grinned. There’s a laugh in everything if you look, was one of Pa’s philosophical gems at moments of complete disaster. Sam had just had a vision of telling him the sad truth about his mother, and then adding, “Oh, by the way, the good news is you’ve got a half-sister who’s a lezzie.”

She lifted Frek’s hand gently and said, “Mig’s no priest, believe me.”

“None of us can be sure of who we are until we put it to the test,” said Frek.

“Tested and proved,” said Sam, opening her door.

As Frek got out, she looked up. From the window immediately above the door a tall white-haired figure waved with a graceful economy of motion that would not have been out of place on a papal balcony. Sam felt his gaze register her too, then he turned away as Frek pushed open the front door.

“Come in,” she said. “Let’s go into the kitchen and have a cup of tea, then I’ll check if my grandfather is able to see you.”

But Sam’s eyes were fixed on the staircase, computing where the entrance to the room above her head would be located. That solved, she was done with calculation. Time to let instinct have its head.

“You take tea if you like, Auntie,” she said. “Me, I’m late for an appointment.”

And then she was off running.

The document Dunstan Woollass put into Mig’s hands at first reminded him of Alice Woollass’s household ledger, which had also consisted of sheets of foolscap-size paper each divided into three columns by two neatly drawn vertical lines. But by contrast with Alice ’s bold firm hand, the writing here was both faded and cramped.

Observing he was having difficulties, Dunstan offered him the magnifying glass.

And now the detail of Francis Tyrwhitt’s job log sprang out at him, and the impression of workaday domesticity faded into a background against which the horror of what he was reading stood out even more violently.

The first and narrowest column (about an inch) contained dates and times.

The second and broadest (perhaps four and a half inches) contained questions put and answers received.

So it must have been to open a filing cabinet in the office of a concentration camp and realize that here, neatly and efficiently stored, were the records of murder.

As he read, it became clear that this was no random application of pain but a carefully modulated progression, directly linked to the answers received.

It started on April 7th 1589.