Devil in the Darkness by Archie Roy

Devil In The Darkness - Archie Roy

A sudden snowstorm in the Scottish Highlands strands a newly married couple in a crumbling Victorian mansion known as Ardvreck House, along with a team of paranormal investigators and demolition experts already there, seeking proof that the mansion is haunted before the old pile is reduced to rubble.
Archie Roy, a noted astronomer and physical researcher, brings a sane, scientific approach to the haunted house genre, without losing an ounce of atmosphere or dread. And avoiding the cocksure, self serving/self promoting nonsense that oozes from such 'paranormal investigators' as the Warrens. The suspense steadily mounts without being bogged down by the dry tone scientific writing has been known to be plagued with.

Originally published in 1978 and brought to America for the first time by Valancourt Books (Where do they find these wonderful lost gems?)