Sheila Connolly has written several cozy mystery series and this is the second one I've read of the County Cork Mysteries. (Buried in a Bog was a New York Times bestseller).
From the cover:
Bostonian Maura is beginning to feel settled in her new Irish home, just in time for summer tourist season to bring fresh business to her pub. But the first traveler to arrive is thirsty for more than just a pint of Guinness. Althea Melville is hot on the trail of a long lost Van Dyck painting.
You don't need to read these in order, but I recommend you read Buried in a Bog first because it gives you a lot of information about Irish traditions and in particular about Maura's family and how she came to live in Leap, County Cork. Ms. Connolly takes a lot of her own family history to develop her characters. She found a pub in Leap called "Connolly's" which she doesn't think has any family connection, but nevertheless became the setting for her mystery series.