Lethal Whispers (Deadly Highlands 6)

Ghosts are just unfinished business...
Secrets and scandals haunt a prominent family. But that might not be the only thing. When a body is found in a room locked from the inside and outside, DCI Keane knows this case is unique. And not because of all the ghost stories surrounding the crime scene. His partner, DI Murray, isn't so sure.
Determined to keep this case in the real world, DCI Keane starts with the family of the victim. Between a domineering matriarch, insidious sisters, and an annoying ghost hunter who just won't leave Keane alone, the detective is swimming in suspects. It doesn't help that mysterious and seemingly unexplainable supernatural happenings continue to impede the investigation.
A detective's job is already hard enough but when you add ghosts into the mix, it becomes seemingly impossible. But with Keane's track record and stubbornness, only he can catch the killer and silence the deadly whispers.