Murder in Thistlecross — Amy M. Reade

The emerald hills and violet valleys of Wales seem the ideal place to start over after murder -- and divorce -- shattered Eilidh's life in the Scottish Highlands. But within the stone walls of an ancient castle, a family's dark, violent past threatens much more than her newfound tranquility . . .

For the past two years, Eilidh has called the quaint Welsh village of Thistlecross home, embracing her new life as estate manager of a restored fifteenth-century castle. But the long-anticipated arrival of her employer's three estranged sons and their wives transforms Gylfinog Castell from a welcoming haven to a place seething with dangerous secrets. When the escalating tensions culminate in murder, Eilidh must sift through a castle full of suspects both upstairs and downstairs. She can trust no one as she follows a twisting maze of greed and malice to ferret out a killer who's breaching every defense, preparing to make Eilidh the next to die.