Mary Ellen Hughes
Maggie Olenski, a young high school math teacher in Baltimore, Maryland:

Resort to Murder (2000)

A Taste of Death (2003)

Jo McAllister, the proprietor of Jo’s Craft Corner, in the small town of Abbotsville, Maryland, in the Craft Corner mysteries:

Wreath of Deception (2006)

String of Lies (2007)

Paper-Thin Alibi (2008)

Piper Lamb, owner of Piper's Picklings, a pickle store in the small town of Cloverdale, New York, in the Pickled and Preserved series:

The Pickled Piper (2014)

License to Dill (2015)

Scene of the Brine (2016)