To Sleep With Evil - Ravenloft The Covenant

In the demiplane of mists, even the dead have their revenge . . .
 
Desperate to escape the terrors of Ravenloft, Marguerite came to Lord Donskoy's castle full of hope for the future. Instead, she found herself betrothed to a mysterious purveyor of flesh whose secret past, like the dead, refused to stay buried.
 
Long ago, Donskoy had committed a heinous crime against the Vistani, Ravenloft’s enigmatic gypsies. He believed he had escaped their wrath, but the unloving can afford to be patient.
 
Now Donskoy's marriage has invoked a dark curse, and Marguerite into a web of fear and passion spun by a gypsy with the power to reach out from beyond the grave.