Having been brought up on a standard diet of Agatha Christie, I usually find all other crime novelists wanting as there is no "Aha!" at the end in most of them. The mystery may be well imagined and plotted, but Dame Agatha's trick of producing the rabbit out of the hat cannot be emulated by anyone else. That is why I was not a big fan of P. D. James initially.
Over the years, however, I have come to value the literary quality of her novels. While the others are content to write competent English and leave the characterisation to a few deft sketches, James takes enormous care over both. Her English is a joy to read, and her characters, down to the most insignificant of them, are meticulously sketched. And in this particular novel, the way she has described the Thames and the life along it is so evocative as to take one's breath away. This is one mystery I read slowly, savouring the language all the way.
Gerard Etienne, first among equals of the partners owning the Peverell Press is the murder victim - he's enough of a blackguard to qualify for the honour. (In fact, had this been a Christie novel, he wouldn't have gotten past page 20 alive.) Self-centered, ruthless and entirely lacking in any kind of sentiments, he has pissed off virtually everybody including the other partners, staff and clients. So it is no wonder that he winds up as a dead body in the small archives room, a victim of carbon monoxide poisoning in a carefully contrived accident.
As Adam Dalgliesh and his able deputies, Kate Miskin and Daniel Aaron arrive on the scene, the plot thickens with red herrings, broken alibis, and more murders...
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As mysteries go, this was a pretty decent one. The solution is entirely satisfying and believable, with a final twist which is impossible to see coming. I would say had I really racked my brains I could have solved it partway at least, but that does not take away from the cleverness of the plotting.
However, two things dragged down this mystery from 4 to 3 stars for me: (1) a superfluity of characters whose lives are described at length, but who do not contribute much to the story and (2) the anticlimax of the denouement (no, that's not a spoiler!). I believe the author should have kept it tighter and worked more on her climax.