Deadly Liaisons by Elle James

People have been known to perish at McGregor Manor… 

Opening her B and B to a group of ghost hunters, Molly McGregor hopes the spirits rumored to be there will appear. She needs the weekend to be a financial success. But when disembodied voices and hazy images nearly lure her to her death, Molly's driven straight into the arms of a sexy but mysterious guest–Casanova Valdez. 

Nova knows what it's like to be haunted–by memories of a case gone bad. As a secret agent, he's confident he can protect Molly but is not exactly sure he believes in ghosts. As the mysterious incidents targeting the gorgeous redhead become increasingly more dangerous, Nova must question if it's the handiwork of a ghost…or a killer.