Death at Blenheim Palace

"Invited to Blenheim Palace, home of the Duke and Duchess of Marborough, to work on a book about the murder of a young mistress of King Henry II, Charles and Kate find themselves investigating the kidnapping of a young maid and the disappearance of the duke and his mistress."@en
"Kate Sheridan is at Blenheim Palace to research King Henry's mistress Rosamund, said to have been poisoned there by Eleanor of Aquitaine. But her visit takes a strange turn when her hosts unwittingly begin to relive the legend."@en
"Invited to Blenheim Palace, home of the Duke and Duchess of Marborough, to work on a book about a centuries-old scandal involving the murder of a young mistress of King Henry II, husband and wife scholars Charles and Kate Sheridan find themselves investigating the all-too-current kidnapping of a young maid and the mysterious disappearance of the duke and his mistress."