These endless detective programmes with their countless detectives need an inexhaustible supply of crimes to solve, and to keep them interesting they need new scenarios in which these murders can occur. And it's at this point where they tend to throw realism to the winds - that's why the sleepy village of Kembleford where Father Brown lives between the wars has a holiday park called Chummy's, a film studio, a cabaret drag club, a new age cult, a secret military base and various drug dealers - and that's before you add in the things that pass through such as a circus (every single programme has a murder in a circus AND a fair at some point), an escaped bank robber, an African freedom fighter and, in one memorable episode, a UFO.
My favourite programme at the moment is Brokenwood Mysteries - that's because I love Midsomar Murders, but sadly I've seen virtually every episode. Luckily BM is basically MM but moved to NZ, it's set in sleepy but beautiful countryside and in every episode a scenario (eg a circus) is set up and then a murder occurs, then the irascible Kiwi Barnaby and his sidekicks interview everyone involved again and again slowly closing in on the murderer with a few moments of gentle humour until, the "wait a minute, that's it!" moment when breakthrough occurs and they go and arrest the guilty party, often with some kind of low speed chase involved or possibly the villain threatening to throw themselves or someone else from a high point until our hero talks them down. Those are my least favourite bits in fact, when the mystery has been solved but they seem to feel they have to half-heartedly put in some underwhelming action scenes before the credits, at least to the credit of whoever makes MM* they stopped doing this regularly at some point, I guess someone realised how shit those segments were, you watch these things to get a ridiculous puzzle satisfyingly solved, you don't want to see an overweight, overage Bergerac - who clearly needed a stunt-double to climb a few rungs of a stepladder in one episode - chasing down and disarming a gunman, no amount of creative editing will make it look good.
*presumably the producer Brian True-May, that name always sticks out to me, I like to think that he has no living relatives and he is the one True-May, but I digress