Death by Irish whiskey / Catie Murphy.

Enhanced descriptions from Syndetics:

Dublin limo driver Megan Malone finds her relationship on the rocks when a double murder at the whiskey festival draws her in - despite promising her girlfriend she'd quit sleuthing for good...

Perfect for fans of Carlene O'Connor, Sheila Connolly, and Rob Osler alike, Catie Murphy's acclaimed Dublin Driver Mystery series is a charming blend of Irish humor, compelling whodunnits, and the allure of the Emerald Isle.

"There is so much to like about the cozy perfection that is Catie Murphy's Dublin Driver series from the lush Irish travelogue to the precise balance between comic relief and crime." -Bookpage STARRED REVIEW for Death on the Green

The competition for best whiskey in Ireland will be a publicity bonanza for the winner, and that means there are celebrities involved-like boxer Angus McConal and Megan's friend Niamh, an up-and-coming actress who's teamed up with Megan's uncle, the retired Sligo harbormaster. But rivalries and revelries turn out to be a bad blend when McConal dies at a whiskey tasting. Megan promised her girlfriend she'd quit her amateur sleuthing, but with Niamh and her uncle as suspects, she's over a barrel . . .

With her relationship on the rocks, Megan gets in even deeper when a second entrant in the competition is killed-and her investigation starts zeroing in on a suspect. Now she just needs proof . . .