Widow's Pique (en Inglés) - Marilyn Todd

When the King of Histri invites Claudia to visit, she assumes it's connected to her role as a merchant of fine wines. How wrong can she be? And, before long, all manner of assumptions are proved false. The kingdom is a paradise of rolling vineyards, olive groves and golden beaches lapped by the velvety-warm Adriatic - but the more Claudia learns about Histrian society, the more deeply involved she becomes in the tragedy unfolding within it. Did genuine accidents befall the King's family? Or were their deaths caused, as she suspects, by something more sinister? Worse, why does no one believe her when she tells them she witnessed a murder?