Bones are found in the lane behind her son's house. Her best friend and one of the owners of her local become persons of interest for a murder she knows they couldn't possibly have committed. And the most incompetent homicide investigator on the planet, or so she believes, is the lead investigator. Of course, Mary-Margaret O'Shea, a woman of a certain age with mildly Machiavellian tendencies, has no choice but to get involved.

In Mary-Margaret and The Case of The Thieving Barmaid, the second book in A Pint of Trouble Mystery series, unusual alliances, strange coincidences, and more than a few costume changes lead Mary-Margaret into a world she would have just as soon left unseen.