The British mystery writer weighs in:

Like most series writers, you see, I never set out to go down this path. I wrote the first Costa book as a standalone and was then asked to turn it into a series by my publisher. After which I made it up as I went along, mistakenly sometimes though I’m pleased to report the errors I committed were by no means rare.

Here, when I set out to write the Amsterdam series, are some of the pitfalls I told myself to avoid.

One of the mistakes he cites: Failing to plan for how the series will deal with the passage of time, as the years go by between books in the real world.

Different series writers handle the passage of time in different ways. Spenser and the other characters in the Robert B. Parker series aged at a rate of 1:2 for the real world for a decade or so, then it appeared they just stopped aging. In the early books, written in the 70s, Spenser referenced being a Korean war vet and an ex-boxer who once fought Jersey Joe Walcott. In the last books by Parker, written in the 2000s, those references are left out.

In the Nero Wolfe books, the characters stay exactly the same age throughout 30 years, while the outside world progresses. In the first book, Nero is in his early 40s and Archie is about 30 and they’re toasting the end of Prohibition. As the series hit its prime, Archie is enlisted in the Army during World War II — fortunately assigned to stay home in Manhattan. In the last book, Nero is in his early 40s and obsessed with Watergate, and Archie is about 30.

By the way, both the Spenser and Nero Wolfe series were continued by other writers after the original author’s death. I read one of the Spenser novels by Ace Atkins; it was pretty good. Surprisingly, it was better and more true to the characters than the later Parker novels were.

I also read one of the Robert Goldsborough Nero Wolfe novels, and found it disappointing. He had the details right, but the voice was off. For example: The book was written and set in the 80s, and the mystery revolved around some detail of personal computing technology. Archie had become a PC expert by then, and provided a clue to solve the crime. Nero Wolfe was portrayed as an antiquarian who disdained PCs.

But I thought that was precisely the opposite of the spirit of the books. Archie, as a man of action, would have disdained PCs in the early years. He’d have learned to use one, because he did Wolfe’s office work, but he would have no particular affinity for them. However, the sedentary genius Wolfe might have taken to PCs, because they are logical like he is, and he can use one while moving nothing other than his fingers and eyes.