I avoided picking this up for quite a while, mostly because I’m just not that interested in Agatha Christie’s work — she wrote some great mysteries, but I’m more interested in characters, and I’m not overly fond of any of hers. (Poirot and his mannerisms drive me mad, sorry.) It turns out that while this does talk a lot about Christie’s work, it also relates her ideas to actual chemistry — of which she’d have been aware of as an assistant in a dispensing chemist — and actual murders that she may have found inspiration from.
All in all, it becomes a rather entertaining little package, not just focused on recounting the plots of Agatha Christie’s books. The chemistry involved was pretty easy for me to follow, but bear in mind that I am in my last year of a science degree! It might get a little too involved for people who are interested in this from the Agatha Christie end of the equation (while not, I think, being worth reading just for the explanations of how poisons work, because there’s a lot of social info and stuff about Christie and her plots as well). Fortunately, if you are a fan of Christie, Harkup doesn’t spoil any of her plots — or in the rare cases she has to for the sake of explaining things properly, she warns you in advance.
I still would’ve liked to see it be about the Golden Age crime fiction in general, and then Harkup would’ve had a great one to analyse in the shape of Sayers’ Strong Poison… but that’s beside the point.