The Haunted Lady is the second in the Hilda Adams series by Mary Roberts Rinehart. It has dropped to $1.99 at Kindle US and Kobo US (coupon/VIPable).
Kindle US:
https://www.amazon.com/Haunted-Lady-...dp/B07PDPLRKC/
Kindle US/Smile:
https://smile.amazon.com/Haunted-Lad...dp/B07PDPLRKC/
Kobo US:
https://www.kobo.com/us/en/ebook/the-haunted-lady-1