(With the Flemish nationalists split between those that want to join the Netherlands and those that want an independent Flanders, but the Netherlands and Germany willing to fund all of them)Dogged, mustachioed leader of a Belgian secret police squad fighting leftists and Flemish nationalists probs
(/s) but now I’m curious what a gritty Poirot reboot would look like haha
However Poirot actually spends most of his time in Britain, so you could have him deal with considerably more anti-Belgian feeling getting in the way of his cases.
Curtain (in which Poirot dies) is pretty dark. Arguably he commits murder there. (https://en.wikipedia.org/wiki/Curtain_(novel))