This was a very enjoyable 1960s suspense novel about Annette, a smart, hard-working young woman at a magazine publisher's who has been knocked off her feet by the combination of her father's recent death and her surprise win of a very large sum of money at football pools. This, along with a bout of pneumonia, leaves her physically weak, prone to dissociation, and thus on leave from her job to recover. At her frenemy Joanna's suggestion she's bought a pretty house in the town of Crowbridge (a fictionalised Rye, according to Google) which is conveniently set on the edge of a marsh to provide a nice place for the inevitable chase scenes and accidental near-drowning in fog that this genre of book demands. (That is not a spoiler, you can read the book yourself to see if it happens -- but the genre does want it.)
The usual gothic-ish suspense hinges on the question of trustworthiness -- who can the heroine trust, and who is attempting to manipulate her and get her money/title/land/pretty self for their own devices? Can she, in fact, trust herself, or are the strange happenings (ghosts, thumps in the night, kidnapping attempts) just her imagination? Often this second piece of the puzzle fails for me because it is obvious the author intends the heroine to be basically right about what is happening, even if some particular event (a ghost sighting, say) is misunderstood. I found it interesting that Aiken makes it unambiguous that Annette's dissociation renders her an untrustworthy narrator -- she cannot account for all of her time, she doesn't know what she doesn't know, and that makes her more vulnerable to the machinations of those around her. It was very solidly done, interesting and fun to read, and inspires me to carry on with my Aiken binge.