The blurb was right about one thing, though: this is a smashing book.
Set in New Orleans in 1833, A Free Man of Color is the story of Benjamin January. January is a highly-educated and urbane physician; he is also a dark-skinned black man. Forbidden by the color of his skin to practice surgery in New Orleans, he makes a living as a piano teacher. He becomes involved in the murder of a young woman who, like his own sister, was the mistress of a white man. January's ability to investigate is hampered by his constant danger of being stolen from the streets and sold into the slavery from which, as a child, he was freed.
The wonderful thing about this novel is the richness with which slave-era New Orleans is rendered. The city had recently been acquired from France by the United States, and Hambly fascinatingly depicts the cultural clash between the Americans and the French, as well as the constant, degrading consciousness of skin color among January's fellow freedmen.
Hambly has a masters' degree in history, and she obviously did an enormous amount of research for this series. All the detail lends depth to the story without overwhelming it. If you enjoy historical mysteries with lots of atmosphere, you'll like these books.
Here are the titles:

A Free Man of Color
Fever Season
Graveyard Dust
Sold Down the River
Die Upon a Kiss
Wet Grave
Days of the Dead
Dead Water