I am working my way through Poirot Investigates (again) and this is the best of them so far. Tempting as it is for my horror-loving self to believe in ancient curses knocking off a series of archaeological scholars, it did seem more unfortunately likely that someone was using the idea of an ancient curse as a cover. So it proved. 

I'd like to say that normally people wouldn't be so credulous, but not so long ago there was a pandemic and a run on horse medicine, so curses all round, I say.