Margaret Frazer, The Widow's Tale

Another Dame Frevisse mystery, set in the days of the weak King Henry VI of England. The rumbling war in France -- ]the 100 years war -- isn't going well for England. A minor courtier dies of natural causes, leaving his widow and her brother with a dangerous secret -- a paper that could bring down the powerful earl of Suffolk.

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The murders are not really the drivers of the plot, in this one; it's more of a political and psychological thriller, with plenty of betrayal and suspicion to go around.