I’m here with Empting, Cilli and Harlan. Bill Harlan has appeared briefly but I don’t see him again until we sit down to taste. He formally handed over control of Harlan Estate, Promontory, Bond and The Mascot in 2021, appointing 37-year-old Will managing director. Cilli (44) arrived in 2012 and is in charge of vineyard and winemaking at Promontory.

Promontory is an 840-acre fastness, a deep valley folded into the foothills of Mount Veeder, on the west side of the Napa Valley. From the highway, you think the looming ridge you’re looking at is the edge of Sonoma. But there’s another ridge beyond and between them this interesting domain. It’s remote, even by Napa standards (contrary to opinion, there are plenty of wild spaces in the county). The ultra-refined French Laundry is a couple of miles away but it might be in Wisconsin for all the relevance it has up here.

Bill Harlan had come upon it hiking in the 1980s. ‘I used the Carmelite monastery [we’d passed it on the way up] as a base and just started climbing’. There were no vines but he was intrigued by its seclusion. It might be possible vineland for the Napa project he had in mind. In the end, Harlan Estate was founded less than a mile to the north but for 25 years Harlan kept the idea of that parcel tucked under his hat (he never mentioned it, Will says) before it came on the market in 2007 and he snapped it up.

The owner – the Harlans don’t reveal who that is – had planted 80-odd acres of Cabernet Sauvignon. It was neglected, the vines overgrown. Trees had been felled and never collected. ‘It was a mess,’ Will says. ‘It looked like a logging operation.’

But it is magnificent. Vineyards, some a mere half-acre, are etched into towering, wooded hillsides and drop down into cavernous combes dense with oak and fir. The whole estate is thickly forested, the vines often shaded on three sides. An old drovers’ road, running through the woods, will suddenly open out on a wide vista of vineyard and scree. Everything is deeply, lushly green in the steadily falling spring rain.

The geology of the land is unusual, in that it rests on two distinct fault lines and consists of all three soil types that are found in Napa: volcanic, sedimentary and metamorphic. ‘You get all three in the same soil pit,’ Cilli notes. This, combined with the wild variation in aspect and the microclimate of the valley-within-a-valley, gives credence to Harlan’s claims that this part of Napa is like nowhere else in California. When the celebrated soil scientists Claude and Lydia Bourguignon came, they found the experience ‘novel’.

Cilli said he fell in love with Promontory at first sight. It reminded him, in part, of his native Tuscany, but it was the wildness that captivated him, ‘I love that character that you can see in the wines.’ He said it was probably ‘the only project that could keep me in the valley.’

You get the impression none of them can quite believe their luck. ‘It somehow redefined what looks beautiful,’ Will says. It also redefined their ideas of winemaking. He goes on: ‘We were used to control. Harlan in the 1990s was obsessed with organisation and uniformity but Promontory was wild.’

The theme of wildness recurs. Harvest times are key to ‘find a way for it to come through,’ Will says. Empting: ‘Pick too late and you lose the ruggedness.’ Ageing, in the magnificent Howard Backen-designed chai, is all in Stockinger Austrian oak barrels ranging in size from 10,000 to 46,000 litres, for up to 36 months. ‘The fine-yet-tight tannins required longer barrel-ageing but [we] didn’t want the wine to be overpowered by new oak’. It’s a constant process of refinement and improvement – ‘we learn something new each season’.

Empting: ‘It has blown every expectation out of the water. We were excited and we were scared. We didn’t know what this beast would be. Our learning curve has been very steep, it remains very steep. At least now we’re starting to get our arms around it but at the beginning, it was like: God, we cannot figure this thing out.”

You have to remember we’re talking about winemaking here, not Wittgenstein. But ‘interpretation of terroir’, if it’s to mean anything at all, should be taken seriously. I’ve seen vineland all over the world – rock-strewn fields in the Andean foothills, rainless Spanish deserts – but I’ve never seen anything like Promontory. Were I to be tasked with bottling the soul of that vineyard, I’d reach for metaphor as well.

And so we come to the missing shade of blue. This is the concept propounded by the 18^th-century philosopher David Hume, that an idea can be formulated without a previous sensory impression to give rise to it. He asked, Could a shade of blue missing from a spectrum be imagined by an observer?

Harlan says (with a smile – he does have a degree in philosophy) that Promontory is the missing shade of red. ‘Until you’ve seen and experienced it, you don’t know that it’s missing. And so for us this was that final piece. The piece that wasn’t there that we had the opportunity to understand and try to translate into the wine.’

The next morning, in gorgeous May sunshine, we gather to taste. It’s almost the same group, though smaller, that did the mighty vertical of Harlan estate from magnum in 2020. Bill Harlan is there (he sweetly thanks the team for allowing him to taste, saying it’s the first full vertical of Promontory he’s ever done), Will, Empting, Cilli and the journalist Elaine Brown. We wonder, at the end, if there is thread that runs through the wines. In my notes the words ‘deceptively light’ recur, as do ‘structure’ and ‘stone’. Reaching for metaphor again, Will Harlan compares the structure of the 2016 to cathedral stone, which has ‘both weight and lightness. It’s intricately carved and light filters through the windows.’

I found in the 2016 a moment where the various elements come together: the savoury nose, the fine tannins, the weight without heaviness. Will Harlan calls this vintage an ‘inflection point’ and notes how the tannins are the ‘main differentiators’. Yes, agrees Cilli, ‘and because of the character of levity and lift, we have to be precise with the tannins.’ The younger vintages have an astonishing latent energy, tannins under tight rein, aromas bursting, the fruit compacted.

Brown and I were struck not by the sophistication of these wines but by their honesty. Brown WhatsApped me later. ‘Promontory is the most transparent to place. The wines are impressively well crafted and elegant while still offering an almost wild or primal complex of flavours.’

‘How do we take wine from a wilderness and have sophistication?’ Will asked. It’s a great question – with their resources, the Harlans could do anything they liked with Promontory. After all, they have to make a wine that will please their audience. But this was so unexpected. The tasting revealed a keen focus on the land and the vintage. The difference between the years was often marked – the challenge of 2015 for example showed in the wine – yet we could see that common thread running through, even as the wines increased in elegance.

And what of Will’s quest for the missing shade of red? The wines are unmistakeably Californian – that splendid 2017 could come from nowhere else – but they are also unlike anything I’ve tasted in Napa, which is quite a claim, in the world’s most cultivated wine region.

Perhaps the last word should go to Bill Harlan, who started the whole thing. He speaks hardly at all during the tasting, his Old Testament face giving little away. At the end of the morning, he talks of his fascination with the ‘ongoing discovery’ of the project. The wines have character, layers and depth, he says, and – by way of praising their authenticity – he notes, ‘You never know what’s coming next.’