I got this book at one of the Library Used Book Sales last spring. Yes, I know I swore off buying more books after Jeff got me the 1000 books from the estate sale for $100 a couple of years back. But I donated many of those to the 2 libraries which are within 5 miles of my house because I just didn't love them, so I'm entitled, right? And at $1 or $2 for a nice hardcovered book, how can I possibly refuse?
THE CIRCULAR STAIRCASE
Mary Roberts Rhinehart
Miss Rachael Innes is a spinster who took in her niece and nephew after her brother died. They rent a summer house out of the city (presumably Pittsburgh) each year, and this year is no exception; they've rented Sunnyside, It seems like a nice enough place, but on the second night they're there, strange noises begin to occur; on the third night, Arnold Armstrong, the son of the house's owner, is shot in the house. A number of seemingly unrelated events occur: Paul Armstrong, the house's owner, dies while on vacation in Colorado. His bank fails, and its head clerk is suspected of having something to do with the failure. Rachael's nephew is abducted. One of the servants turns up dead, maybe of a heart attack, and maybe not.
This was a good mystery by a prolific author. It's available both in real book form, and as a free Kindle e-book (because it was copyrighted before 1923). I have a few more of her books in real book form, and I downloaded about 15 of them, so I have plenty of reading material available should I long for another great mystery!
Interesting side note: Mrs. Rhinehart started writing when her husband, a doctor, lost substantial money in a stock market crash in 1905; by 1910 she was making $100,000 per year! Holy Cow!