Murder at an Irish castle / Ellie Brannigan.

Enhanced descriptions from Syndetics:

Rodeo Drive bridalwear designer Rayne McGrath expected her thirtieth birthday to start with a power lunch and end with champagne, lobster, and a diamond engagement ring from her fiance. Instead, flat-broke and busted, she's on a plane to Ireland where she discovers that she's inherited a run-down family castle. Uncle Nevin's will contains a few caveats - for example, if Rayne doesn't turn McGrath Castle around within a year, the entire village will be financially destroyed. With the fate of the town in her hands, and rumours that Rayne's uncle's death wasn't actually an accident, she can't possibly go back to her old life in L.A. As the devastating truth about her uncle dawns on Rayne, it s not just her reputation that's on the line, it's her life. Featuring a sharp and endearing protagonist, a colourful and quirky locale, and replete with twists and turns befitting an old Irish village, the first in Brannigan's mystery series transports us to a milieu as romantic as it is deadly.