HE'S WRITTEN six action packed novels - but he's shunned fame and acclaim.
Even now, his public still don't know his real identity.
A K Robertson - that's his pen name - enjoys blissful anonymity in Huddersfield.
The former hospital consultant took up writing as a new career in retirement.
Now, aged almost 81 he insists his latest book, The Brotherhood Affair, could be his last.
The 320-page thriller, published by the Book Guild, features a ruthless, atrocity-instigating gang - and a hapless yachtsman who gets embroiled their plot to subvert world peace.
Though originally from Scotland, Mr Robertson, a widower, has lived in Huddersfield for more than 40 years.
He says: "I'm nearly 81 and I don't think I'll write another book. It usually takes me about six months and it's getting a bit much."
He loves to write cleanly, concentrating on the plot and its pace, without too much flowery language.
"I keep description and conversation to a minimum.
"Some books today are so hard to get through," he explains.
"And so many books are published, on so many subjects, it's a challenge to come up with a new and different theme."
Throughout his books - which include The Golden Treasure Of Athos and Warriors For The Working Day - he's drawn on his travels in Greece, Egypt and Asia as part of his national service and frequent trips abroad during his working life.
Of his pen name, Mr Robertson said: "The publisher already had an author with my surname, so I had to choose another.
"But I also liked preserving my anonymity. Though this one isn't terribly racy, some of my earlier books had their fair share of sex and violence.
"This way, I could choose who I wanted to know I'd written it."
The doctor, who has three sons and six grandchildren, continues: "My oldest grandchildren have read some of my work - though I know young people prefer to listen to pop music than read!"
He has a tip for other aspiring novelists. "Always know what your ending is going to be!"