Above the town, a team of officers were attempting to follow the route that the Pearsons might have taken from Castleton on the night they disappeared. It had been done before, but DCI Mackenzie had insisted on it being done again. The scope of the search had been widened, taking in a broad sweep of the moor right over to Speedwell Cavern and Winnats Pass on one side, and including the Limestone Way itself on the other.
In most parts of the country it would be impossible to imagine how two people could simply disappear in open countryside like this. But Cooper was aware of what lay underneath his feet. The whole of this landscape was hollow. It was one huge lump of porous limestone, scooped out over millennia by running water to form endless caves and tunnels and passages.
The Peak Cavern system alone ran for more than ten miles before it emerged at Speedwell, and it included the deepest shaft in the UK, twice the size of St Paul’s Cathedral. Rain falling on the surface in Cavedale found its way through to the show caverns below and fell as lime-stained waterfalls on the heads of tourists.
Even Sir Arthur Conan Doyle had once said: ‘All this county is hollow. Could you strike it with some gigantic hammer it would boom like a drum.’ In that wider context, it was far too easy to imagine anything disappearing.
Cooper glanced out of the car window. Up Castle Street, he could see the sign outside the George, directly opposite the parish church. He dialled Carol Villiers’ mobile number, and she answered after three or four rings.
‘Where are you, Carol?’
‘Still at the George.’
‘Anything?’
‘No. The story stays the same, right down to the details. Except the details are becoming a bit vague by now. I’ve been going through the names of the other people who were eating here that night. I know it’s been done before …’
‘Hasn’t it all?’ said Cooper.
‘Well … anyway, they’re all in the clear. No connection with the Pearsons, so far as I can tell. One couple were from Sussex, which I suppose is not a million miles from where the Pearsons lived.’
‘Did they speak to each other?’
‘Not that we know of. Not that anyone saw.’
‘A washout, then.’
‘Of course, we don’t have all the names,’ said Villiers. ‘Some of the customers are unaccounted for. So there are gaps.’
Cooper sighed. ‘I know. Thanks, Carol.’
‘I’m leaving the George in a few minutes. I’m going to go past the Green.’
‘Fine.’
Details of the Pearsons’ movements towards the end of that night were sketchy, and had to be partly speculation. What was known for certain was that they’d arrived at the George, where they’d booked a table for dinner at seven thirty. Since their Range Rover III was still standing outside The Old Dairy next day, the presumption was that they’d walked to Castleton. The owner of the cottage confirmed they were keen walkers — that was why they came to the Peak District, they’d said. At the George, staff who’d served them remembered that they’d come in wearing outdoor clothes and walking shoes. It wasn’t at all unusual; Castleton was a centre for walkers at any time of the year.
Cooper thought about the photographs of the Pearsons again. You couldn’t always tell the outdoor types, of course. And the Peak District had enough variety to attract anyone. But personally, he wouldn’t have pegged David Pearson as the kind of man to be hiking over the moors in the middle of winter. The activity had its attractions, without a doubt, but it was minority appeal. Most people would have jumped into the car and driven to Castleton. Almost everyone, in fact, even if they hadn’t bothered to check the local weather forecasts. It was one of the factors that had fuelled theories that the Pearsons had set the whole thing up. If you looked at it that way, it was the unlikeliest element of the scenario. Yet from the evidence, that seemed undoubtedly to be what had happened.
Okay, so the meal had gone off uneventfully. The mushrooms in peppercorn sauce, the Bantry Bay mussels, the honey-glazed ham shank. The Pearsons’ table hadn’t been close to the windows, so they might not have noticed the weather deteriorating. It was only a bit of sporadic sleet anyway. A few wintry showers. What was that to a couple of determined, experienced walkers with the right gear?
But wait a minute. Exactly how experienced were the Pearsons? Cooper made a note to find out. The original inquiry had traced their movements the day before their visit to Castleton, but those had all been by car, surely? They’d filled up the Range Rover at Sickleholme service station, so they must have been using fuel. A trip into Buxton for the Christmas market, maybe. Afternoon tea at the Old Hall Hotel. The Twelve Days of Christmas at Chatsworth House. That would have been David and Trisha’s style, if he wasn’t mistaken.