The Donaghue sisters have shared all the joys and struggles of a complicated past, and at the center of it has been the Whiskey Island Saloon, a historic Irish-American pub overlooking Lake Erie that has been in their family for five generations. Megan, who runs the saloon, is planning a wedding. Casey is busy settling into the life she shares with her new husband. And Peggy has put her medical degree on hold after discovering her young son is autistic.

When the sisters receive a letter from a relative in Ireland whom they have never met, their lives are changed forever. As an unforgettable tale of star-crossed lovers and murder unfolds, the sisters discover a hidden legacy that will lead them home at last to Ireland.