This novel is a murder mystery, spy thriller, and ghost story all in one, and manages to be laugh-out-loud funny, uneasily creepy when reading late at night, and solemnly poignant about the horrors of war. Any of these is a rare achievement, but combining all together make this something really unique. Set in England during the first world war, spiritualism is on the rise, as so many young men are missing/presumed dead on the front.
The Highmount patriarch made his fortune in weapons manufacturing during the war, but has since lost both his sons. In their grief, he and his wife have retreated to their remote island estate, which is converted from an old abbey and rumored to be haunted. They plan a house party over the holidays, inviting several spiritualists to attempt to make contact with their sons.
There are the charlatans, of course, like Madam Frey, with all sorts of tricks up her sleeves. But there are also the real deal, like Kate, friend of the family and ex-fiancé to one of the Highmount boys, who can actually see ghosts, but finds it so socially embarrassing that she hides it as well as she can. And there’s spiritualist Count Orlov, who can perhaps see ghosts but may find it more convenient to fake the séances?
Add to all that, some confidential weapons designs have been discovered in the wrong hands, and three undercover personnel, who have complicated relationships to each other, are suborned into attending the house party, under a variety of subterfuges, causing even more confusion.
Of course, there is also a light romance, which is so deftly done that I had to double check that the author is male. The two protagonists have a slow growing attraction toward each other, built on mutual respect and good communication, which is also awfully rare and a very pleasant surprise in novels.