An Italian nobleman is murdered in 1821, but the authorities announce the death as a heart attack, fearing political unrest if the truth were known. It takes four more years before the true cause of death is revealed, even to the deceased's wife.
Julian Kestrel, an English "dandy" (and apparently in those days the word was not a disparagement), is traveling on the continent, and decides to try his hand at solving the murder. He is apparently experienced at such things, having been the hero of three (?) previous books by Ms. Ross, which I haven't read. So he travels to Italy, along with his somewhat curmudgeonly friend Dr. MacGregor, inveigles his way into the inner circle of the widow, and begins to detect.
Ross does a fine job of portraying the post-Napoleonic period in northern Italy, as its political intrigues run rampant even while the rich and famous are enjoying their operas, their villas, and other perquisites of their status. The murder plot is one of the most complex I have ever encountered in a mystery (and I have read hundreds of them). In fact, once the murder is solved and all the "good guys" rescued from danger, it still requires another 40 pages to explain all the events in the story. Those last 40 pages strike me as very slightly clumsy, as Julian goes from person to person, interviewing them all until every t has been crossed and every i dotted. Perhaps Ross didn't realize until she got to that point in the story, that there were dozens of loose ends to be tied up.
But the writing is excellent, the characters well drawn, and the motivations plausible. And again, the portrayal of the Italian society in that time period is particularly vivid and enjoyable. I second the grief of the previous reviewer who expressed disappointment upon learning of the death of the author, who apparently died while still in her early 40's. This book definitely made me want to go back and read the other Julian Kestrel novels, and I'm sorry that there won't be any more of them.