Six years ago I started reading Simon Raven's perfect Doctors Wear Scarlet (1960). I wrote after finishing it that I did not need to read another novel. I have read a handful since then, and enjoyed each. But I think my 2017 conclusion is still a sound judgment.
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“I’m sorry, Mr Seymour,” he said. Then he produced an identity card which said he was Inspector John Tyrrel of the Metropolitan Police.
“How did you get in?”
“I’m sorry, sir,” he said again. “The caretaker… I showed him my card.”
“My telephone number’s in the book,” I said. “As far as I’m concerned the police can ring up for appointments just like anybody else.”
“I’m sorry,” he said; “but you see this isn’t really an official visit. I’ve just come–”
“If this isn’t an official visit,” I said, “then so much the more could it have waited until some reasonable and pre-arranged hour of the day.”
Doctors Wear Scarlet (1960) by Simon Raven
https://www.amazon.com/Doctors-Wear-Scarlet-Simon-Raven/dp/1842321803