Black Coffee is a bit of an anomaly in the Christie oeuvre, as it was written by Dame Agatha as a play and only novelized in the 1990s with the blessing of the Christie estate.
Poirot and Hastings rush to a wealthy scientist’s home only to discover that they’ve arrived too late. Sir Claud is dead, paperwork regarding his latest multi-million-pound invention has gone missing–and someone in the house is to blame.
It’s early in the Poirot-verse, so the Mysterious Affair at Styles is still fresh on the minds of the characters–luckily for them, because this play borrows an important plot point from that story. This isn’t a dealbreaker per se for me, though, as this play was probably a lot of folks’ introduction to Poirot, Hastings, et al.
Enjoyable enough, but a very light read that leaves me longing to see it performed!