Chloe Hadjimotheou

It's the summer of 2015 in Rainer Wynne's second book, The Wild Silence.

The couple are living in the Cornish coastal town of Polruin and Moth's been studying horticulture at university.

But the sedentary lifestyle means his health is getting worse.

The neurological condition he has means his memory's going and he's losing weight and limping.

In desperation, Rainer starts digging into medical papers, trying to understand why moths' health was so much better when they took their massive walk along the southwest coastal path the previous year.

Moth has CBD, not Alzheimer's, but both illnesses involve a build-up of protein in the brain, so Rainer thinks this study must be relevant.

Then she tells Moth about another paper that shows that plants release chemicals that have a positive effect on humans.

The Salt Path isn't just a memoir about a difficult time in Moth and Rainer's lives.

It's about how grit and perseverance, coupled with true love and nature, is a recipe that revives the dying moth in a way that modern medicine can't.

It's about a secular miracle.

These are Rainer Wynne's books, but in many ways it's Moth's story.

And yet Moth is largely absent from all the publicity.

Rainer's headlined so many literary festivals, been on dozens of chat show sofas and countless podcasts.

And Moth has only done a handful of media appearances.

Of course, that's understandable given his terminal neurodegenerative illness.

But when he does appear in public, he's not camera shy.

Here he is on Channel 5 at Hay Farm, talking about why most cider apples aren't good to eat.

Elsewhere, he's appeared on the red carpet with Jason Isaacs and beamed into the one show with his own video message for the actor who played him in the Hollywood movie of his life.

There's also this video I found online before I released my investigation.

It was made by a charity called the PSPA that represents people with CBD.