The Haunting of Belle Sauvage — Lynne Connolly

After three weeks of married bliss, Jordan Arcenaux wants a divorce. Reeling from his rejection, Karey agrees to exorcise Belle Sauvage, a plantation house being renovated as a luxury resort.
The ghosts of Belle Sauvage are dangerous. They want a treasure lost a hundred years before, the sapphire necklace known as the Blue Star, but more than that, they want to find a way back to life. They want Karey.
Newly made vampire Jordan follows his vampire ex-lover to Belle Sauvage to try to save the wife he still loves. Karey can't be part of his new life, but his efforts to push her away become more desperate as he tries to save her from himself and Karey makes it clear she doesn't want to be saved.
Ghosts in search of a body to inhabit, a lost treasure and a voodoo practitioner turned rogue all conspire against Jordan and Karey finding any kind of happiness together.
But in the heat of the Louisiana night, that's all they can think of and all they want. Despite impossible odds, they still want each other.